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Conversion of P.E to K.E

a stone of ma...

Question

a stone of mass 0.05 kg is dropped from top of a 50 m tall building. what will be its kinetic energy when it hits the ground.

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Solution

Dear Student ,
Just before touching the ground all of its potential energy converts in to kinetic energy .
So the kinetic energy will be equal to the potential energy of the stone.
So the kinetic energy of the stone before touching the ground is = Mgh = 0.05 x 10 x 50 = 25 J
Regards

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