Challenge Problem: Two blocks of masses mi - 2.00 kg and my = 4.00 kg are each released from rest at a height of h=5.00 m on a frictionless track, as shown below, and undergo an elastic head-on collision. a) Determine the velocity of each block just before the collision. b) Determine the velocity of each block after the collision. c) Determine the maximum heights to which both m, and m2 rise. Figure P9.77