a steel ball of mass 0.400 kg is fastened to a cord that is 0.600 m long and fixed at the far end. the ball is then released when the cord is horizontal. at the bottom of its path, the ball strikes a 2.00 kg steel block initially at rest on a frictionless surface. the collision is elastic. (a) Find the speed of the ball just after the collision.
(b) Find the speed of the block just after the collision.