1. The problem statement, all variables and given/known data A particle of mass m and and velocity v collides with a square of mass M (at rest)whose movement is confined to rotation about its centet. I must now solve for the angular velocity and the velocity of the particle after the collision (elastic collision) 2. Relevant equations Kinetic energy and angular momentum 3. The attempt at a solution Since the collision if elastic the sum of the kinetic energies is certainly maintained. Linear momentum seems to not be maintained. Angular momentum about the point of rotation must be maintained since the only exfernal force seems to be the object the square if mounted on which cannot have a torque at that sams point. So convervation of energy gives me one equation but I cant seem to formulate an equation with conservation of angular momentum.