A railroad freight car weighing W,=32 tons and traveling V.=5.0 ft/sec overtakes one weighing W=24 tons traveling V,=3.0 ft/sec in the same direction. (a) Find the speed of the cars after collision and the loss of kinetic energy during collision if the cars couple together. (b) If the collision is elastic, the freight cars do not couple but separate after collision. What are their speeds? (1 ton = 2000 1b) , 1 ft=0.3m, 1lb is equivalent to 0.454 kg)