Problem 2 At the end of a hockey practice, a player shoots a blue puck at a compact hockey puck bag containing 5 red pucks. Just before collision, the blue puck is sliding horizontally toward the bag at 30.0 i 0.5 m/ S. Right after the collision, the blue puck continues moving in the same direction, pushing the bag with red pucks with it (that is, assume a perfectly inelastic collision). The ice friction is negligible; the mass of the empty bag is 145 i 5 g, the mass of one puck (blue or red) is 165 i 5 g, the uncertainties are independent and random. Before collision After collision a) Find the common speed right after the collision and its uncertainty. b) Compute the ratio of final to initial kinetic energy of the system