A steel ball of mass 0.45 kg is fastened to a cord that is 90.0 cm 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 4.50 kg steel block initially at rest on a frictionless surface. The collision is elastic. Find a. the kinetic energy of the ball just before the impact b. the impulse on the block from the ball c. the change of kinetic energy of the ball after the collision d. the velocity of the ball and block after the collision if the steel block is replaced with rubber of same mass that can capture the ball after the impact.