CBSE > Class 09 > Science | CBSE Board | Homework Help

The repeated reflection the results in the persistence of sound is called reverberation. To reduce Rverberation the roofs and the walls of auditorium were generally covered with sound absorbent material like compressed fireboard rough plaster and draperies.

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Smriti Gupta 3 weeks, 4 days ago

The repeated reflection of sound in large halls, auditorium etc,that results in persistence of hearing is called reverberation. It is reduced to a value where it is no longer audible.

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Jina Nath 3 weeks, 4 days ago

The repeated reflection of sound in large halls, auditorium etc,that results in persistence of hearing is called reverberation. It is reduced to a value where it is no longer audible.

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Khushboo . 3 weeks, 5 days ago

Reverberation is the repeating of sound in big enclosed space is called Reverberation Its can reduced by celling walls and by using sound observing material like Vollen and fibers boards

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Bhawna Sharma 3 weeks, 5 days ago

Reverberatin is the repetition of the sound in the medium

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ANSWER

What are limitations of rutherford model of an atom ?

Posted by 10200 Paritosh Sunil Khandare 3 weeks, 5 days ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 weeks, 5 days ago

According to the Rutherford model, an electron orbiting around the nucleus continuously radiates energy due to the acceleration; hence the atom will not remain stable.
This model could not explain the origin of the line spectra of atoms. Or As electron spirals inwards; its angular velocity and frequency change continuously; therefore it will emit a continuous spectrum.

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Smriti Gupta 3 weeks, 4 days ago

1 According to the Rutherford model, an electron orbiting around the nucleus continuously radiates energy due to the acceleration; hence the atom will not remain stable. 2This model could not explain the origin of the line spectra of atoms. Or As electron spirals inwards; its angular velocity and frequency change continuously; therefore it will emit a continuous spectrum.

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ANSWER

Explain why the sole of a shoe is worn out.

Posted by Subankar Sikdar 1 week, 2 days ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 1 week, 2 days ago

When we walk on the ground the force of friction between the sole of our shoe and the ground acts opposite to the direction of our motion. It is this force of friction which gradually wears out the sole of our shoe.

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ANSWER

Two childrens are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air an aluminium to reach the second child. Given velocity of sound in air and aluminium are 346 m/s and 6420 m/s respectively

Posted by Subankar Sikdar 3 weeks, 5 days ago

CBSE > Class 09 > Science

0 answers

ANSWER

Train starts is motion from rest and against the speed of 60 km per hour in 5 minutes it moves with the same information and then explain decreases uniformly to particular hour in next 3 plots free time graph and find the total distance covered by the train

Posted by Prachi Singh 3 weeks, 5 days ago

CBSE > Class 09 > Science

1 answers

Rahul Bisht 3 weeks, 4 days ago

Ye paper m nhi ayaga

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ANSWER

Assertion: A body completing circular motion has a average velocity zero. Reason: in a circular motion direction is changing continuously

Posted by Prachi Singh 3 weeks, 5 days ago

CBSE > Class 09 > Science

2 answers

Shantanu Madake 3 weeks, 2 days ago

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Harshit Tomar 3 weeks, 5 days ago

A is false but R is true

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ANSWER

What is sound and how it is produced

Posted by Truptimayee Kadambala 3 weeks, 5 days ago

CBSE > Class 09 > Science

5 answers

Mrunali Salunke 1 week, 5 days ago

Sound is a form of energy which produce sensation of hearing to our ears sound is produced due to vibration of objects

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Sneha Panchal 2 weeks, 6 days ago

It's is produced by vibration Sensation of hearing in our ear

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Sarthki Kulkarni 3 weeks ago

Sound is the form of energy which give us senction of hearing it can be produced by collision of two objects

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Smriti Gupta 3 weeks, 5 days ago

Sound is a form of energy which is produce by the collision of two things

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Rahul Bisht 3 weeks, 5 days ago

Sound is a form of energy which is produce by the collision of two things

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ANSWER

What is Suside bags

Posted by Shivam Sharma 3 weeks, 6 days ago

CBSE > Class 09 > Science

5 answers

Drashti Makan 3 weeks, 2 days ago

Lysosomes are called as suicide bags

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Smriti Gupta 3 weeks, 5 days ago

Lysosomes

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Shantanu Madake 3 weeks, 5 days ago

Lysosomes

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Parth Goyal 3 weeks, 5 days ago

Lysosomes

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Debayan Kar 3 weeks, 5 days ago

Lysosomes are suside bags

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ANSWER

1) A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Posted by Subankar Sikdar 3 weeks, 6 days ago

CBSE > Class 09 > Science

2 answers

Smriti Gupta 3 weeks, 4 days ago

250*3.6*100

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Gowtham Kumar Dk 3 weeks, 6 days ago

250*3.6*100

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ANSWER

1. Calculate the number of moles in 17g of hydrogen peroxide (H2 O2). a) 2 mole b) 1 mole c) 1/2 mole d) 3 mole

Posted by Subankar Sikdar 3 weeks, 6 days ago

CBSE > Class 09 > Science

3 answers

Smriti Gupta 3 weeks, 4 days ago

1/2 mole

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Shivam Sharma 3 weeks, 6 days ago

1/2 mole

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Subankar Sikdar 3 weeks, 6 days ago

C) 1/2 mole

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ANSWER

In NH3 nitrogen and oxygen are combined in a ratio of 14:3. What mass of nitrogen is required to react completely with 1.5 g of hydrogen gas?

Posted by Saanvi Chopra 3 weeks, 6 days ago

CBSE > Class 09 > Science

1 answers

Smriti Gupta 3 weeks, 4 days ago

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At some moment, two giant planets Jupiter and Saturn of the solar system are in the same line as seen from the earth. Find the total gravitational force due to them on a person of mass 50 kg on the earth. Could the force due to the planets be important? Mass of the Jupiter = 2 × 1027 kg Mass of the Saturn = 6 × 1026 kg The distance of Jupiter from the earth = 6.3 × 1011 m The distance of Saturn from the earth = 1.28 × 1012 m A bag of sugar weighs ‘w’ at a certain place on the equator. If this bag is taken to Antarctica, then will it weigh the same or more or less. Give a reason for your answer.

Posted by Sehajpreet Kaur 4 weeks ago

CBSE > Class 09 > Science

1 answers

Sehajpreet Kaur 4 weeks ago

In Δ ABC, P and Q are the mid-points of sides AB and BC respectively. ∴ PQ || AC and PQ = 12 AC ( Using mid-point theorem) …..(1) In ΔADC, R and S are the mid - points of CD and AD respectively. ∴ RS || AC and RS = 12 AC ( Using mid-point theorem) …..(2) From equation (1) and (2) , we obtain PQ || RS and PQ = RS Since in quadrilateral PQRs, one pair of opposite sides is equal and parallel to each other , it is a parallelogram. Let the diagonals of rhombus ABCD intersect each other at point O. In Quadrilateral OMQN, MQ || ON (∵ PQ || AC) QN || OM (∵ QR || BD) Therefore, OMQN is a parallelogram. ∴∠MQN=∠NOM and ∠PQR=∠NOM However, ∠NOM=90∘ (Diagonals of a rhombus are perpendicular to each other) ∴∠PQR=90∘ Clearly , PQRS is a parallelogram having one of its interior angles as 90∘ Hence, PQRS is a rectangle.

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ANSWER

A sample of pure water, irrespective of its source contains 11.1% hydrogen and 88.9% oxygen. The data support

Posted by Konthoujam _Malemnganbii_Chanu Chanuu 4 weeks ago

CBSE > Class 09 > Science

2 answers

Smriti Gupta 3 weeks, 4 days ago

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Harsh Soni 4 weeks ago

Tha answer is 2

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ANSWER

Find the average mass of isotopes CL³⁵(75%) and CL³⁷(25%)

Posted by Daksh Agarwal 4 weeks, 1 day ago

CBSE > Class 09 > Science

3 answers

Smriti Gupta 3 weeks, 4 days ago

35.5 u

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Srishti Singh 4 weeks, 1 day ago

For calculating this firstly u have to see it's mass number and percentage Formula- (Percentage×mass number/100) Calculation:- (75% × 35/100) + (25% × 37/100) =} (2625÷100)+(925÷100) =} (3550÷100) = 35.5u Answer :-. 35.5u *THANK YOU* 😊

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Akshadeep Meshram 4 weeks, 1 day ago

Exam hone wala hai kya tera?

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ANSWER

Different between prokaryotic

Posted by B. Wamsi 4 weeks, 1 day ago

CBSE > Class 09 > Science

1 answers

B. Wamsi 4 weeks, 1 day ago

Answer Kya ha

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ANSWER

How we get food?

Posted by Gauri Gauri 4 weeks, 1 day ago

CBSE > Class 09 > Science

2 answers

Shivam Sharma 3 weeks, 6 days ago

We get food from plants and animals

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Gauri Gauri 4 weeks, 1 day ago

We get food from plants and animals

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ANSWER

Why should we were cotton clothes in summer?

Posted by Disha Bs 3 weeks, 6 days ago

CBSE > Class 09 > Science

5 answers

Akshadeep Meshram 3 weeks, 5 days ago

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Tanisha Chavan 4 weeks, 1 day ago

We should wear cotton clothes in hot summer days to keep us cool and comfortable this is due to the following reason: during hot summer we perspire more. Sweat is mainly water the cotton clothes are good absorber of sweat so cotton clothes absorb the sweat produced on our skin quickly and expose it to the atmosphere for evaporation the evaporation of sweat from cotton clothes takes the latent heat of vaporization from our skin in this way our skin loses heat and make us feel cool and comfortable.

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Rishu Sindhu 4 weeks, 1 day ago

Cotton , being a good absorber of water and help in absorbing the sweet

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Kiran Pargaien 4 weeks, 1 day ago

Because cotton clothes absorb the swet from our body and also takes heat from our body and from that heat cotton clothes will evaportes that sweet and as we know evaporation vaise colony effect . So, as the swet will evaporate our body feels cool.

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Shashank J 1 month ago

We will wet

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ANSWER

Atom & Molecules

Posted by Kartik Gamer'S 1 month ago

CBSE > Class 09 > Science

1 answers

Debayan Kar 3 weeks, 3 days ago

What type of questions from you asked

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ANSWER

Prokaryotic cell diagram

Posted by Anshu Gupta 1 month ago

CBSE > Class 09 > Science

3 answers

Pankaj Choudhary 3 weeks, 5 days ago

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Neeraj Gujjar 001 1 month ago

Gujhar

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Sakshi Sakshi 1 month ago

Prokaryotic cell diagram

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ANSWER

Reproduce

Posted by Gunjan Dongre 1 month ago

CBSE > Class 09 > Science

2 answers

Sudhir Kumar 4 weeks, 1 day ago

Which one

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Pankaj Choudhary 1 month ago

😂

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ANSWER

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child. Given velocity of sound in air and aluminium are 346 ms-1 and 6420 ms-1 respectively.

Posted by Deepti S 1 month ago

CBSE > Class 09 > Science

1 answers

Pankaj Choudhary 3 weeks, 5 days ago

Don't post personal information, mobile numbers and other details.
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Ask specific question which are clear and concise.

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ANSWER

Which one of the following is a correct electronic configuration of sodium?

Posted by Aman Singh 1 month ago

CBSE > Class 09 > Science

5 answers

Saanvi Chopra 3 weeks, 6 days ago

2,8,1 K,L,M

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Rishu Sindhu 4 weeks, 1 day ago

2,8,1

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Sudhir Kumar 1 month ago

2 8 1

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Smriti Gupta 1 month ago

K L M N 2 8 1

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Aryan Adarsh 1 month ago

3S¹

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ANSWER

Different between homogeneous mixture and heterogeneous mixture

Posted by ༆٭۝AкคSн٭۝࿐ ༆ 1 month ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 1 month ago

Homogeneous mixture	Heterogeneous mixture
It has a uniform composition	It has a non-uniform composition
It has only one phase	There are two or more phases
It can’t be separated out physically	It can be separated out physically
‘homo’ means the same	‘hetero’ means different
Example: a mixture of alcohol and water	Example: a mixture of sodium chloride and sand

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Pankaj Choudhary 3 weeks, 5 days ago

Don't post personal information, mobile numbers and other details.
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ANSWER

What are Phanerogams ? Point out differences between its two groups

Posted by Priyansu Sahoo 1 month ago

CBSE > Class 09 > Science

2 answers

Akshadeep Meshram 4 weeks, 1 day ago

Diversity in living organisms deleted hai syllabus se!

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Priyansu Sahoo 1 month ago

Phanerogams are flowering plants. Its two groups are Gymnosperms and Angiosperms: Answer: Gymnosperms Angiosperms (i) They produce naked seeds. (ii) Considered more primitive in evolutionaiy term. (i) They produce well protected seeds, inside a fruit. (ii) Considered most highly evolved in evolutionary terms.

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ANSWER

What do you mean by nucleus in chemistry

Posted by Anuja Aggarwal 1 month ago

CBSE > Class 09 > Science

5 answers

Priyansu Sahoo 1 month ago

The nucleus is an organelle found in eukaryotic(having nucleus) cells. Inside its fully-enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes. The nucleus is made up of a double membrane nuclear envelope that keeps the entire organelle encased, isolating its contents from the rest of the cell, and the nucleoskeleton which supports the cell as a whole. The nucleus maintains the security of the genes and controls the functions of the entire cell by regulating gene expression. This is why the nucleus is sometimes referred to as the control center, or the "brain," of the cell.

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Priyansu Sahoo 1 month ago

The nucleus is the center of an atom. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electrons. Neutrons have no charge and protons are positively charged. Nucleus is highly dense because of the whole mass of atom is concentrated in the nucleus, with electrons contributing negligible mass.

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Priyansu Sahoo 1 month ago

What is the nucleus? The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles. Outline the structure of the Nucleus. A double-membraned organelle known as the nuclear membrane/envelope engirdles the nucleus. The nucleolus is found within the nucleus, occupying 25% per cent of the volume. Thread-like, dense structures known as chromatins are found within the nucleus containing proteins and DNA. The mechanical strength for the nucleus is provided by the nuclear matrix, a network of fibres and filaments which performs functions similar to the cytoskeleton.

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Priyansu Sahoo 1 month ago

The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric charge.

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Aryan Singh 1 month ago

Nucleus which means it's a small entity of atom where proton and neutron were merged. Its contain whole mass of an atom.

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ANSWER

What is defination of dendrite

Posted by Garvit Khunteta 1 month ago

CBSE > Class 09 > Science

3 answers

Priyansu Sahoo 1 month ago

Dendrite Dendrites are long structures that connect nerve cells (neurons). These take up a lot of space on a neuron’s surface. They receive a large number of messages from other neurons and have specialised proteins that receive, process, and send these signals to the cell body. Organelles in dendrites allow them to modify protein density in response to changes in neuronal input frequency. This permits neurons to retain normal activity, which helps to prevent neurological illnesses like epilepsy. Dendrites are therefore essential for appropriate neuronal function and play a key part in physiological processes including memory formation . Function of dendrite Dendrites have the ability to accept impulses from other neurons, process them, and transmit the information to the neuron’s soma.

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Priyansu Sahoo 1 month ago

Dendrites: Many short fibres called dendrons arise from the cell body of neuron. They further divide to form dendrites. Dendrites receive messages from other neurons.

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Priyansu Sahoo 1 month ago

Dendrites are the finger-like cells present on the end of a neuron. They are short, branching fibres extending from the cell body of the nerve cell. This fibre increases the surface area available for receiving incoming information.

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ANSWER

What is Power and its formulae

Posted by Monendra Singh 1 month ago

CBSE > Class 09 > Science

1 answers

Priyansu Sahoo 1 month ago

It is also defined as the amount of energy transferred or converted per unit time. P o w e r = W o r k d o n e T i m e t a k e n. The SI unit of power is watt. One watt is 1 joule per second.

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ANSWER

What is balanced forces and unbalanced forces

Posted by Debayan Kar 1 month ago

CBSE > Class 09 > Science

3 answers

Debayan Kar 4 weeks, 1 day ago

Priyanshu don't copy Full page

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Priyansu Sahoo 1 month ago

Table of Contents What are Balanced Forces? Balanced Forces Examples What are Unbalanced Forces? Unbalanced Forces Examples Difference between Balanced and Unbalanced Forces Frequently Asked Questions – FAQs What are Balanced Forces? If the resultant force of all the forces acting on a body sums up to zero, then the forces acting on the body are known as balanced forces. Let us look at some examples of balanced forces and understand how the body’s state of motion remains unaffected. Balanced Forces Examples Suppose you are pushing a wall, and as expected, the wall does not move and neither do you. It means that you and the wall are exerting a balanced force on each other. Balanced Force When the man pushes against the wall, the forces at play balance each other, and as a result, the wall does not move. The image below shows a game of tug of war between equally matched opponents. Neither of the participating teams can pull the other team towards themselves due to balanced forces. Balanced Force A game of tug of war with equally matched opponents is an example of balanced force The image displayed above is a game of tug-of-war between two equally matched teams. Neither of the teams is able to pull the opposing team towards itself. This is an example of balanced forces. What are Unbalanced Forces? When the resultant force acting on a body is not equal to zero, the forces acting on the body are known as unbalanced forces. The body acted upon by unbalanced forces changes its state of motion. Let us look at some examples of unbalanced forces to understand their nature better. Unbalanced Forces Examples Let us consider the same tug of war example that we discussed in the previous section. When the forces are balanced, neither of the teams, but if the rope moves away in a particular direction or if a team wins, then the forces applied by both teams are unbalanced. Practically anything that moves is a result of the exertion of unbalanced forces on it. If you kick a football and it moves from one place to another, it means that the unbalanced troops are acting upon it. Unbalanced Force The ball moves from one place to another after it’s kicked. This is an example of an unbalanced force. The image below shows two people on a seesaw. The person on the right is significantly heavier than the person on the left, and the seesaw is effectively tilted towards him. This is an example of unbalanced forces. Unbalanced Force One person significantly heavier than the other creates a condition of unbalanced forces in a seesaw. The above image shows two people on a seesaw. The person on the right is significantly heavier than the person on the left and the seesaw is effectively tilted towards him. This is an example of two unbalanced forces. Differences Between Balanced and Unbalanced Forces Some of the significant differences between balanced and unbalanced forces are listed below in the table. Balanced Forces Unbalanced Forces The forces are equal in magnitude The forces are unequal in magnitude It does not cause any change in the state of motion of the object. Causes change in the state of motion of the object. Watch the video to understand balanced and unbalanced forces with the help of animations! 27,431 Related Links What is Force? Types of Force Newton’s First Law of Motion Frequently Asked Questions – FAQs What are Balanced Forces? If the resultant force of all the forces acting on a body sums up to zero, then the forces acting on the body are known as balanced forces. What are unbalanced Forces? When the resultant force acting on a body is not equal to zero, the forces acting on the body are known as unbalanced forces. What are examples of balanced forces? A game of tug of war between equally matched opponents is an example of balanced forces. What are examples of unbalanced forces? One person significantly heavier than the other creates a condition of unbalanced forces in a seesaw. What is the difference between balanced and unbalanced forces? Balanced forces do not cause any change in the state of motion of a body. Unbalanced forces accelerate the body. Stay tuned to BYJU’S and Fall in Love with Learning! Test your knowledge on Balanced Force Quiz Image Put your understanding of this concept to test by answering a few MCQs. Click ‘Start Quiz’ to begin! Select the correct answer and click on the “Finish” button Check your score and answers at the end of the quiz PHYSICS Related Links Ampere Formula Amplitude Modulation And Demodulation Angle Of Incidence And Angle Of Reflection Advantages And Disadvantages Of Non Renewable Energy What Is Electric Potential Difference Working Principle Of Ac Generator Alternating Current Physics Derivation Of Second Equation Of Motion What Is Relative Velocity Define Modulus Of Elasticity Important Physics Topics Thermodynamics Laws Of Physics Carnot Engine Concave And Convex Mirrors Centripetal And Centrifugal Force Physics Symbols Poissons Ratio Frictional Force Projectile Motion Electric Current Electromagnetism Rotation And Revolution Uniform And Non-Uniform Motion SI Units List Derivation Of Physics Formulas Ohm's Law Archimedes’ Principle Kirchhoff's Law Newton's Laws Of Motion Laws Of Reflection CBSE Sample Papers CBSE Sample Papers Class 8 Science CBSE Sample Papers Class 9 Science CBSE Sample Papers Class 10 Science CBSE Sample Papers Class 11 Physics CBSE Sample Papers Class 11 Chemistry CBSE Sample Papers Class 11 Biology CBSE Sample Papers Class 12 Physics CBSE Sample Papers Class 12 Chemistry CBSE Sample Papers Class 12 Biology CBSE Previous Year Question Papers CBSE Previous Year Question Papers Class 10 Science CBSE Previous Year Question Papers Class 12 Physics CBSE Previous Year Question Papers Class 12 Chemistry CBSE Previous Year Question Papers Class 12 Biology ICSE Sample Papers ICSE Sample Papers Class 8 Physics ICSE Sample Papers Class 8 Chemistry ICSE Sample Papers Class 8 Biology ICSE Sample Papers Class 9 Physics ICSE Sample Papers Class 9 Chemistry ICSE Sample Papers Class 9 Biology ICSE Sample Papers Class 10 Physics ICSE Sample Papers Class 10 Chemistry ICSE Sample Papers Class 10 Biology ISC Sample Papers Class 11 Physics ISC Sample Papers Class 11 Chemistry ISC Sample Papers Class 11 Biology ISC Sample Papers Class 12 Physics ISC Sample Papers Class 12 Chemistry ISC Sample Papers Class 12 Biology ICSE Previous Year Question Papers ICSE Previous Year Question Papers Class 10 Physics ICSE Previous Year Question Papers Class 10 Chemistry ICSE Previous Year Question Papers Class 10 Maths ISC Previous Year Question Papers class 12 ISC Previous Year Question Papers Class 12 Physics ISC Previous Year Question Papers Class 12 Chemistry ISC Previous Year Question Papers Class 12 Biology Register For Free Ask A Doubt Join BYJU'S Learning Program Name Mobile Number City Grade/Exam Email Address 7 Comments JAYA KUMAR JULY 31, 2019 AT 6:51 PM very good and brief explanation !!! THANK YOU SOOOOOOOO MUCH!!!!!!!!!!!!! Now only i cleared my doughts REPLY karan kumar MARCH 5, 2020 AT 1:35 PM thank you BYJU’S REPLY Jenny MARCH 26, 2020 AT 2:44 PM thank you very good information REPLY manasvi gupta JUNE 23, 2020 AT 10:29 AM excellent response REPLY Ananya OCTOBER 8, 2020 AT 8:42 PM Amazing explanation! REPLY Ayush JANUARY 4, 2021 AT 8:12 PM Thank you byjus REPLY Saqlain Sayed FEBRUARY 11, 2021 AT 7:25 PM Thank You Very Much for the explanation. I understood the concept. Thanks A Lot!!!!!!!!😊 REPLY Leave a Comment Your Mobile number and Email id will not be published. Required fields are marked * * Mobile Number * Please don't use any HTML or external links in the comment box. 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Aditi Vidhuri 1 month ago

Balanced force - If a number of force are acting on a body and the body does not move than the forces are set to be Balanced force. Unbalanced force - If the resultant of force acting on a body is non-zero, the state of rest or motion of the body changes, such force acting on a body are called Unbalanced force

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ANSWER

What is negative acceleration

Posted by Debayan Kar 1 month ago

CBSE > Class 09 > Science

4 answers

Akshadeep Meshram 4 weeks, 1 day ago

Stop confusing him with wrong answers! Actually, negative acceleration means the acceleration in the opposite direction of motion For understanding this you need to understand about sign convention in physics, For example:- If a body is moving in north direction with a constant velocity, you assume that the north direction is positive Therefore, the south direction will be negative When the body was moving in the north direction(positive direction), the velocity will be positive and if the body will move in the south direction its velocity will get negative. This happens because the velocity is a vector quantity and it needs magnitude and direction also it does not depend on decreasing or increasing of magnitude in depends also on the direction The same applies on the acceleration also if a body is accelerating in the positive direction is side acceleration will be positive and give the body will accelerate in the negative direction it acceleration will be negative For example:- a car is moving with a constant acceleration in the positive direction if the driver applies the break the car will have a retardation and hence after sometime the car will stop But in reality the brakes accelerate in the opposite direction of the motion and by various factors like friction brings to rest Your school teachers will tell you that retardation is the decreasing of velocity but in reality it is the acceleration only but in the opposite direction This will help you in your 11th class and 12th also but if you will follow this you will definitely face many problems in your class

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Debayan Kar 4 weeks, 1 day ago

Rate of change of velocity with time at a negative rate is called negative acceleration

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Priyansu Sahoo 4 weeks, 1 day ago

Negative acceleration: A body is said to be in negative acceleration when its velocity is getting reduced with respect to time. Example: Slow down of car on the application of brakes. Thus, speeding up a car is an example of positive acceleration and slowing down a moving vehicle is an example of negative acceleration.

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Yashmay Saroj37 4 weeks, 1 day ago

decrease in the change of velocity of a body per unit time

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