posted by Joe .
A block of mass m = 2.60 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 6.80 kg which is at rest on a horizontal surface, Fig. 7-46. (Assume a smooth transition at the bottom of the incline, an elastic collision, and ignore friction.)
(a) Determine the speeds of the two blocks after the collision.
(b) Determine how far back up the incline the smaller mass will go.