(i) A block of mass m moving towards right with a velocity V strikes (head on) another block of mass M which is at rest connected to a spring. The coefficient of restitution for collision between the blocks is e = 0.5.
Find the ratio `(M)/(m)` for which the subsequent compression in the spring is maximum. There is not friction.

Ball A collides head on with another identical ball B at rest. Find the coefficient of restitution if ball B has 80% of the total kinetic energy of the system after collision.

Answer

(i) `(M)/(m)=1`
(ii) `1//3`