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Question

A body of mass 2 kg is dropped from a building of height 5m. The maximum kinetic energy body can attain is


A

50 J

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B

100 J

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C

150 J

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D

200 J

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Solution

The correct option is B

100 J


From 1st equation of motion we have, v2 = u2 + 2gh.

As it is dropped so, u = 0 and g = 10 ms2 and h = 5m.

Putting these values we get, v = 10 ms.

So, the body would attain the maximum kinetic energy when it strikes the ground, i.e. K.E = 12× m × v2 ​= 12 × 2 × 102 = 100J


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