Question

A ball of mass 200 g falls from a height 5 m what is its kinetic energy when it just reaches the ground​

Answer 1

Answer:

The sum of kinetic energy and potential energy is always constant.

When ball is at the height of 5 m, it has only potential energy which is = mgh

=0.2×9.8×5 = 9.8 J

(Mass in kg =0.2 kg , g=9.8)

When it reaches on ground,all its P.E converts in K.E

So,K.E when ball reaches to ground = 9.8 J.

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