Explanation
Coefficient of restitution, e
e=-\dfrac{relative\,velocity\,of\,seperation}{relative\,velocity\,of\,appproach}
e=-\dfrac{4(-\hat{i})-4(+\hat{i})}{4\hat{i}-4(-\hat{i})}=1
Hence, coefficient of restitution is 1
Given W= work done
and mass = m
and vertical height= H
and gravitational force= g
W= mgh
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