Two blocks, m1 = 1.50 kg and m2 = 3.00 kg, are traveling to the right along a frictionless surface. Block m1, moving 4.00 m/s, catches up to block m2, moving 2.50 m/s, and the two blocks undergo an elastic collision. (a) Determine the velocity of each block after the collision.  (b) Prove that the collision was, in fact, elastic.

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