The 0.5-lb ball is shot from the spring device shown. The spring has a stiffness k = 10 lb...

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.