14-74. The 0.5-lb ball is shot from the spring device shown. The spring has a stiffness k = 10 lb/in. and the four cords C and plate P keep the spring compressed 2 in. when no load is on the plate. The plate is pushed back 3 in. from its initial position. If it is then released from rest, determine the speed of the ball when it travels 30 in. up the smooth plane. Hints: 1. Don't forget to draw a FBD + a Kinetic diagram for every kinetic problem in Dynamics, including conservation of energy problems. 2. Also, on this problem the 4 cords C stay connected to the plate, hence they are not cut. Ans: v₂ = 32.3 ft/s (side view) 30°

Solved: 14-74. The 0.5-lb ball is shot from the spring device shown. The sprin

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14 74 the 0 5 lb ball is shot from the spring device shown the spring

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14-74. The 0.5-lb ball is shot from the spring device shown. The spring has a stiffness k = 10 lb/in. and the four cords C and plate P keep the spring compressed 2 in. when no load is on the plate. The plate is pushed back 3 in. from its initial position. If it is then released from rest, determine the speed of the bal