can someone show how to do the incorrect ones

A 60.5 kg ice hockey goalie, originally at rest. catches a 13.161 kg hockey puck slapped at him at a velocity of 13.2 mfs. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their nal velocities be in this case? Assume the original direction of the ice puck toward the goalie is in the positive direction. Indicate the direction with the sign of your answer. Hint Final velocity of the goalie \"Lemma mJ'a A battleship that is 5.80 x 10' kg and is originally at rest fires a 1, 190-kg artillery shell horizontally with a velocity of 552 m/s. Hint a. If the shell is fired straight aft (toward the rear of the ship), there will be negligible friction opposing the ship's recoil. Calculate the recoil velocity of the ship. Vrecoil = .0113 x m/s b. Calculate the increase in internal kinetic energy (that is, for the ship and the shell). This energy is less than the energy released by the gun powder--significant heat transfer occurs. AKE = 181.3 MJ