A block of mass m = 2.20 kg slides down a 30.0o incline which is 3.60 m

Question:

A block of mass m = 2.20 kg slides down a 30.0o incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.00 kg which is at rest on a horizontal surface, Fig. 7-46. (Assume a smooth transition at the bottom of the incline) If the collision is elastic, and friction can be ignored, determine
(a) The speeds of the two blocks after the collision, and
(b) How far back up the incline the smaller mass will go.