A ball at rest is dropped from a height ...

A ball at rest is dropped from a height of 12m. It loses 25% of its kinetic energy in striking the ground , find the height to which it bounces. How do you account for the loss in kinetic energy ?

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The correct Answer is:

If ball bounces to height h', then
`mgh'=75%"of" mgh`
h'=0.75h=9m`

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