Question: 1 8 4 5 . The 1 2 - kg slender rod is attached to a spring, which has an unstretched length of 2 m

1845. The 12-kg slender rod is attached to a spring, which has an unstretched length of 2 m. If the rod is released from rest when u =30\deg , determine its angular velocity at the instant u =90\deg .

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