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A wheel having moment of inertia 2 kg-m 2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel's rotation in one minute would be :

1. 2 N m 15  
2. N m 12  
3. N m 15  
4. N m 18  

Correct answer: N m 15  

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