A hockey pucks B rests on a smooth ice surface and is struck by a second puck, A, which was originally traveling at 30m/s and which is deflected 30 degrees from its original direction. Puck B acquires a velocity at 45 degrees with the original velocity of A. a) Compute the speed of each puck after the collision. b) Is the collision perfectly elastic? If not, what fraction of the original kinetic energy of puck A is 'lost'?