The 10-kg rod AB is pin connected at A and subjected to a couple moment of M = 15 N · m. If the rod is released from rest when the spring is unstretched at θ = 30°, determine the rod’s angular velocity at the instant θ = 60°. As the rod rotates, the spring always remains horizontal, because of the roller support at C.

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A k = 40 N/m wwwww C B ing M = 15 N·m 0.75 m