Physics-Linear momentum

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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.
lighter block-
heavier block-

(b) Determine how far back up the incline the smaller mass will go.

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