A steel ball of mass 0.200 kg is fastened to a cord that is 32.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in Fig. 9-65. At the bottom of its path, the ball strikes a 4.80 kg steel block initially at rest on a frictionless surface. The collision is elastic. Find (a) the speed of the ball and (b) the speed of the block, both just after the collision.


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