$A$ wheel having a moment of inertia $2 \; kg \cdot m^2$ about its vertical axis rotates at the rate of $60 \; rpm$ about this axis. The torque required to stop the wheel's rotation in one minute is:

  • A
    $ \frac{2\pi}{15} \; N \cdot m $
  • B
    $ \frac{\pi}{12} \; N \cdot m $
  • C
    $ \frac{\pi}{15} \; N \cdot m $
  • D
    $ \frac{\pi}{18} \; N \cdot m $

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