Figure shows a circular frictionless track of radius R, centred at point O. A particle of mass M is released from point `A (OA = R//2)`. After collision with the track, the particle moves along the track.
(a) Find the coefficient of restitution `e`.
(b) What will be value of `e` if the velocity of the particle becomes horizontal just after collision ?

Answer

(a) `e=0
(b)`(1)/(3)`