The ball launcher in a pinball machine has a spring that has a force constant of 1.23 N/cm. The surface on which the ball moves is inclined a = 16.0 deg. with respect to the horizontal. If the spring is initially compressed 4.96 cm, find the launching speed of a 0.133 kg ball when the plunger is released. Friction and the mass of the plunger are negligible.