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Question

# A body of mass 2kg is dropped from a height of 1m. Its kinetic energy as it touches the ground is (assume g=9.8ms−2)

A
19.6 N
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B
19.6 J
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C
19.6 kg
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D
19.6 m
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Solution

## The correct option is B 19.6 JGiven, mass of the ball (m) =2kg height from the ground (h) =1m Initially, the ball possesses only potential energy. Potential energy =mgh Potential energy =2×9.8×1=19.6J As we know, all the potential energy of the ball will convert into kinetic energy as soon as the ball hits the ground. Hence, Kinetic energy = Potential energy = 19.6J Note that N is the unit of force, hence 19.6N would be incorrect. Similarly for the others.

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