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2. The 12-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 0 = 30°, determine the rod's angular
velocity at the instant 0 = 60°. As the rod rotates, the spring always remains horizontal,
because of the roller support at C.
k = 40 N/m
B
0.75 m
M = 15 N- m,

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