21-31. Rod AB has a weight of 6 lb and is attached to two
Chapter , Problem 21-31(choose chapter or problem)
21-31. Rod AB has a weight of 6 lb and is attached to two smooth collars at its ends by ball-and-socket joints. If collar A is moving downward with a speed of 8 ft/s when z = 3 ft. determine the speed of A at the instant c = 0. The spring has an unstretched length of 2 ft. Neglect the mass of the collars. Assume the angular velocity of rod AB is perpendicular to its axis.
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