1. In the figure shown , a ball of mass m collides perpendicularly on a smooth stationary wedge of mass M , kept on a smooth horizontal plane. If the coefficient of restitution is e , then determine the velocity of the wedge after collision. https://postimage.org/][/PLAIN] [Broken] Given mass of ball = m mass of wedge = M coefficient of restitution = e velocity of wedge after collision = ? answer to problem = (1+e)mv sinθ / M+m sin^2 θ 2. mv = mv1 + Mv2 v1 = velocity of m after collision v2 = velocity of M after collision e = relative velocity after collision / relative velocity before collision 3. The attempt at a solution So I tried conservation of momentum along the common normal , ie at the line of impact but since the wedge can only move in x direction I am stumped and cannot get an answer after solving. Tried center of mass approach and still arriving at weird solution. Any advice will be appreciated. Thanks.