Question

Hello guys

A ball falls on the ground from a height of 2.0 m and rebounds up to a height of 1.5m . find the cofficient of restitution.

Answer 1

When a ball is dropped from a height on a ground surface which has mass larger than mass of the ball, then the resulting impact is considered as the an impact with infinite mass. Due to impact, there is loss of kinetic energy and the law of conservation of momentum is not applicable. 

Coefficient of restitution (e) = √H1/H2


Substituting the given values, 

0.6=√2/h

√2/6=h

0.235