Torque needed to stop a rotating disc or sphere in a given time

1. A.
   $\frac{4\pi M}{3}$ SI units
2. B.
   $\frac{2\pi M}{3}$ SI units
3. C.
   $\frac{\pi M}{3}$ SI units
4. D.
   $\frac{8\pi M}{3}$ SI units

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1. A.
   $0.128\pi Nm,100$
2. B.
   $0.0128\pi Nm,50$
3. C.
   $0.128\pi Nm,50$
4. D.
   $0.0128\pi Nm,100$

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