. A ball of 250 gm is dropped from the height 20 m . Calculate its kinetic Energy when the ball covers the distance equal to 4/5 th of the height. Also find time to cover this distance.
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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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