Two equal spheres each of mass m are in contact on a smooth

Two equal spheres each of mass m are in contact on a smooth horizontal table, and a third equal sphere of mass m\' impinges symmetrically on them. Prove that this sphere is reduced to rest by the impact of 2m\' = 3me, where e is the coefficient of restitution, and find the loss of kinetic energy by the impact

Solution

e = 1/4