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A thin circular ring of mass M and radius R is rotating with a constant angular velocity 2 rad s –1 in a horizontal plane about an axis vertical to its plane and passing through the center of the ring. If two objects each of mass m be attached gently to the opposite ends of a diameter of ring, the ring will then rotate with an angular velocity (in rad s –1 ).

1. ) m M ( M +
2. M 2 ) m 2 M ( +
3. ) m 2 M ( M 2 +
4. M ) m 2 M ( 2 +

Correct answer: ) m 2 M ( M 2 +

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