A pendulum has a 0.500 kg steel ball hanging from the end of a cord of length 70.0 cm but negligible mass. The pendulum is then pulled to a position such that the cord is now horizontal. It is then released from rest. At the bottom of its path, it strikes a 2.50 kg steel block initially at rest on a frictionless surface as shown below. (a) Assuming the collision is elastic, find the speeds of the block and the ball just after the collision. (b) This causes the block to slide into a rough patch where the coefficient of kinetic friction is 0.500 and comes to a complete stop. What is this stopping distance