A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm . The torque required to stop after 2 revolutions is

1. A. 2 10 6 N m
2. B. 2 10 -6 N m
3. C. 2 10 -3 N m
4. D. 12 10 -4 N m

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