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Question

A body of mass 20 kg is dropped from a height of 2 m. If g is taken to be equal to10ms2, the kinetic energy of the body just before striking the ground will be:


A
400 J
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B
4 J
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C
40 J
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D
None of these
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Solution

The correct option is A 400 J
In the case of a body falling towards the earth, potential energy changes into kinetic energy.
In the given case we need to calculate K.E while the body just hits the ground and hence we consider that all the P.E gets converted to kinetic energy near the ground.
K.E=P.E=mgh
=20×10×2
=400 J
Thus, the kinetic energy of the mass is 400 J before it hits the ground.

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