The initial velocity of marble is 0.4m/s.
And the retardation is 0.2m/s²,or a=-0.2m/s²
Now by first equation of motion
v=u+at
where u is initial velocity,v is final velocity a is acceleration and t is time.
Putting the values in the equation,we get
0=0.4+(-0.2)t. (final velocity is 0 because body comes to rest.)
or,0.2t=0.4
or,t=0.4/0.2=2s
 

Motional Electromotive Force

An emf induced by the motion of the conductor across the magnetic field is a motional electromotive force. The equation is given by E = -vLB.  This equation is true as long as the velocity, field, and length are mutually perpendicular. The minus sign associated with the Lenz’s law.

Every polynomial function consists of some combination of addition and multiplication of constant functions and the identity function f(x) = x. Every constant function is continous at every point, as is the identity function. Since the sum or product of continuous functions is continuous, that means every polynomial is also continuous.

Carbon and oxygen reacts in a ratio 3:8 by mass to form Carbon dioxide

Hence the required reaction is ;

C + O2 --> CO2

Carbon : Oxygen = 3 : 8

Due to law of constant proportion, the mass ratio in which the reactants will react will remain constant.

Carbon --> 9 g
Oxygen --> ?

C : O2 = 3:8
9 : O2 = 3:8

9/O2 = 3/8

Mass of oxygen required
= (9/3)×8
= 3×8
= 24 g

There are many reasons attributed to the fall of the Indus Valley Civilisation.

1. The Harappan cities were destroyed by invaders who were probably the Aryans.
2. Natural calamities such as floods, earthquakes and epidemics might have destroyed the civilisation.
3. River Indus might have changed its course and turned the region into a desert.

The young Bismillah loved to play the instrument in peace. The temples of Balaji and Mangala Maiya as well as the bank of river Ganga were his favourite places to practice and enjoy music in solitude. 

B. Applied research

Applied research refers to scientific study and research that seeks to solve practical problems.This type of research plays an important role in solving everyday problems that often have an impact on life, work, health, and overall well-being. Applied research is used to find solutions to everyday problems, cure illness, and develop innovative technologies.
 

Primary Sources

These sources are records of events or evidence as they are first described or actually happened without any interpretation or commentary. It is information that is shown for the first time or original materials on which other research is based.  Primary sources display original thinking, report on new discoveries, or share fresh information.

Examples of primary sources:
Theses, dissertations, scholarly journal articles (research based), some government reports, symposia and conference proceedings, original artwork, poems, photographs, speeches, letters, memos, personal narratives, diaries, interviews, autobiographies, and correspondence.

Secondary Sources

These sources offer an analysis or restatement of primary sources. They often try to describe or explain primary sources. They tend to be works which summarize, interpret, reorganize, or otherwise provide an added value to a primary source.

Examples of Secondary Sources:
Textbooks, edited works, books and articles that interpret or review research works, histories, biographies, literary criticism and interpretation, reviews of law and legislation, political analyses and commentaries.

The question is incomplete

Class Interval = Upper-Class limit – Lower class limit. In statistics, the data is arranged into different classes and the width of such class is called class interval. 

d. Latin

The term statistics is ultimately derived from the New Latin statisticum collegium ("council of state") and the Italian word statista ("statesman" or "politician"). ... Thus, the original principal purpose of Statistik was data to be used by governmental and (often centralized) administrative bodies.

1) Lymphatic system consists of lymph capillaries, lymph vessels, lymph nodes and lymph glands.
2) To supply nutrients to the cells (tissues), the liquid portion of the blood with nutri¬ents flows out of the capillaries. This is called tissue fluid.
3) To transport the tissue fluid into the main blood stream, a separate system called lymphatic system is present.
4) Lymph is the vital link between blood and tissues by which essential substances pass from blood to cells and excretory products from cells to blood.
5) Lymph is the substance that contains blood without solid particles.
6) Tissue fluid is the substance which contains lymph present in the tissues.
7) From intercellular spaces, lymph goes into lymphatic capillaries.
8) Lymphatic capillaries join to form large lymph vessels which finally open into larger veins.
9) Lymph flows only in direction, that is from tissues to heart through veins.
Functions of Lymph:
a) Lymph carries digested and absorbed fats from small intestine to different tissues
of the body. .
b) It helps in removing Waste materials from the cells in the body to drain into blood.
c) Lymph protects cells in the tissues from infection.

d - Methodology

Interquartile Range

The interquartile range (IQR) is the difference between the upper and lower quartile of a given data set and is also called a midspread. It is a measure of statistical distribution, which is equal to the difference between the upper and lower quartiles. Also, it is a calculation of variation while dividing a data set into quartiles. If Q₁ is the first quartile and Q₃ is the third quartile, then the IQR formula is given by;

"Notice

You know an exhibition of science projects is held in the Indira Gandhi indoor stadium every year on children's day. I'm glad to inform you that the Education Minister of Delhi has himself invited our school to visit the exhibition this year.

It is an extremely prestigious opportunity for all of us, and everyone of us must go there.

Sunil/Sunita

Head Boy/Girl

Bright Minds Public School

New Delhi.​"

d. Mode

The empirical relationship between Mean, Mode and Median is given as

Mean – Mode = 3(Mean – Median)

Mean – Mode = 3(Mean) – 3(Median)

-Mode = 3(Mean) – 3(Median) – Mean

-Mode = 2(Mean) – 3(Median)

Mode = 3(Median) – 2(Mean)