A uniform rod AB of length , and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is m 2 3 , the initial angular acceleration of the rod will be

1. A. mg 2
2. B. 3 2 g
3. C. 3g 2
4. D. 2g 3 .

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