A steel ball of mass m is fastened to a light cord of length Land released when the cord is horizontal. At the bottom ofthe path, the ball strikes a hard plastic block of mass M = 4m,initially at rest on a frictionless surface. The collision iselastic.
Find the tension in the cord when the ball's height above itslowest position is 1/2 L. Write your answer in termsof m and g.
Find the speed of the block immediately after thecollision.
To what height h will the ball rebound after collision?