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An object at rest starts moving. It covers a distance of 2m in one second. It covers a further distance of 5m in two second in the same direction. What is its average velocity and acceleration

Posted by Sanjive Prema 6 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 6 years, 4 months ago

As we know,
AVERAGE VELOCITY=DISPLACEMENT/TOTAL TIME
HERE, DISPLACEMENT IS 7M BECAUSE THE BODY IS TRAVELLING IN THE SAME DIRECTION AND TOTAL TIME IS 3 SEC.
SO, AVERAGE VELOCITY IS 7/3 M/S
NOW, ACCELERATION=FINAL VELOCITY-INITIAL VELOCITY/TIME
AS WE KNOW SPEED=DISTANCE/TIME
BUT HERE MOTION IS IN STRAIGHT LINE
THEREFORE VELOCITY=DISTANCE/TIME
=5/2=FINAL VELOCITY
INITIAL VELOCITY=0

SO, ACCELERATION=(5/2-0)/2
AND THIS IS EQUAL TO 5/4 M/S

0Thank You

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