The firing mechanism of a pinball machine consists of a plunger P having a mass of 0.28 kg and a spring of stiffness k=300 N/m. When s=0, the spring is compressed 50 mm.
If the arm is pulled back such that s= 100 mm and released, determine the speed of the 0.41-kg pinball B just before the plunger strikes the stop, i.e., s= 0. Assume all surfaces of contact to be smooth. The ball moves in the horizontal plane. Neglect friction, the mass of the spring, and the rolling motion of the ball.