The spring has an unstretched length of 25 in. If the system is released from rest in the position shown, determine the speed v of the ball (a) when it has dropped a vertical distance of 12 in. and (b) when the rod has rotated 41°. 30" Answers: k = 0.76 lb/in. 8.6 lb 25" 12" (a) v = ft/sec (b) v = ft/sec