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CBSE Class 11-science Answered

A ball at rest is dropped from a height of 10 m. It loses 25% of its kinetic energy in striking the ground. Find the height to which it bounces. Give the reason of loss of kinetic energy.
Asked by Topperlearning User | 09 Jul, 2014, 10:36: AM

Potential energy lost by the ball = Kinetic energy gained by the ball = mgh

On bouncing upward, the ball lost 25% of its kinetic energy and remaining 75% changes back to potential energy.
Let the ball bounce back to height h', then
The loss in kinetic energy of the ball is due to the heat produced by air friction.
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