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Question

If a ball of mass 1 kg is falling from a height 10 m what will be the kinetic energy of the ball when it hits the ground?( take g = 10 m/s2) neglect air drag?


A

100J

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B

50J

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C

10J

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D

0

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Solution

The correct option is A

100J


Initially, the ball has a potential energy which is later converted to kinetic energy.

Potential energy = 1×10×10 = 100 joules when the ball reaches the bottom, all its potential energy is converted to kinetic energy so,

Kinetic energy = 100 joules.


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