A 90.6-kg fullback running east with a speed of 5.04 m/s is tackled by a 94.1-kg opponent running north with a speed of 2.96 m/s. (a) Explain why the successful tackle constitutes a perfectly inelastic collision. (b) Calculate the velocity of the players immediately after the tackle. (c) Determine the mechanical energy that disappears as a result of the collision. Account for the missing energy.