Before cranberry can make it to your dinner plate, it must pass a bouncing test which rates

Question:

Before cranberry can make it to your dinner plate, it must pass a bouncing test which rates it quality. If cranberries having an e > 0.8a are to be accepted, determined the dimensions d and h for the barrier so that when a cranberry falls from rest at A it strikes the plate at Band bounces over the barrier at C.

Before cranberry can make