When a ball hits the ground it gains  P.E. which is converted to K.E., when it bounces upwards and at it's highest point of rebounce it's K.E again gets converted to P.E.. Why does this P.E does not increase with the increase in height of the ball due to rebounce?

Asked by Himadri | 28th Mar, 2020, 01:36: PM

Expert Answer:

This is due to conservation of energy.
Your statement " when a ball hits the ground it gains P.E. is wrong "
Consider the ball is dropped (not thrown with initial speed ) from a height h.
At the time of dropping the ball, all its energy is potential energy.
When the ball hits the ground, it loses all potential energy and all its potential energy is converted into kinetic energy.
Let us assume when the ball rebounce, there is no loss of energy.
Hence due to kinetic energy the ball rises till all its K.E becomes P.E.
By energy conservation, this P.E is same as the P.E. of starting point. Hence it reaches the same starting point

Answered by Thiyagarajan K | 28th Mar, 2020, 02:21: PM

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