During a Washington Capitols' hockey game a player the 160 g puck giving an velocity of 18.0 m/s . The puck slows down to a speed of 15.0 m/s during the 3.0 s it takes to reach his teammate at the other end of the rink.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.