11. A 600-g ball A is moving with a velocity of magnitude 6 m/s when it is hit as shown by a 1-kg ball B which has a velocity of magnitude 4 m/s. Knowing that the coefficient of restitution is 0.8 and assuming no friction, determine the velocity of each ball after impact. 50° VB =4 m/s VA = 6 m/s 40°

A 10-kg ball A moving horizontally at 12 m/s strikes a 10-kg block B . The coefficient of restitution of the impact is 0.4 and the coefficient of kinetic friction between the block and the inclined surface is 0.5. Draw the impulse-momentum diagram that can be used to determine the speeds of A and B after the impact.

A spring is used to stop a 50-kg package which is moving down a 20° incline. The spring has a constant k =34 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. Assume that the kinetic coefficient of friction between the package and the incline is 0.2. 2 m/s 50 kg 8m Cable 20° The maximum additional deformation of the spring in bringing the package to rest is 0.574 x m.

A M8b3 k = 20 lb/ft, PROBLEM 13.65 Blocks A and B weigh 8 lb and 3 lb, respectively, and are connected by a cord-and-pulley system and released from rest in the position shown with the spring undeformed. Knowing that the constant of the spring is 20 lb/ft, determine (a) the velocity of block B after it has moved 6 in., 3 lb (b) the maximum velocity of block B, (c) the maximum displacement of block B. Ignore friction and the masses of the pulleys and spring. B VB = 3.36 ft/s VB = 3.40 ft/s YB = 1.2 ft = 14.4 in. ◄