A steel ball of mass 0.790 kg is fastened to a cord that is 99.0 cm…

A steel ball of mass 0.790 kg is fastened to a cord that is 99.0
cm long and fixed at the far end. The ball is then released when
the cord is horizontal, as shown in the figure. At the bottom of
its path, the ball strikes a 4.90 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.