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Question

A ball is allowed to fall from a height of 10 m. If there is 40% loss of energy due to impact, then after one impact ball will go up to (in m)

Moderate
Solution

mgh = initial potential energy
mgh' = final potential energy after rebound
As 40% energy lost during impact

 mgh'=60% of mgh 
h'=60100×h=60100×10=6m


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