The ball launcher in a pinball machine has a spring that has a force constant of 1.22 N/cm. The surface on which the ball moves is in- clined 15.8 with respect to the horizontal. If the spring is initially compressed 3.68 cm, find the launching speed of a 0.172 kg ball when the plunger is released. The acceleration due to gravity is 9.8 m/s2 . Friction and the mass of the plunger are negligible. Answer in units of m/s
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