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A wheel of mass 40 kg and radius, of gyr...

A wheel of mass 40 kg and radius, of gyration 0.5m comes to rest from a speed of 180 revolutions per minute in 3 s. Assuming that the retardation is uniform, then the value of retarding torque `tau` in Nm is

A

`1 pi`

B

`3 pi`

C

`2 pi`

D

`4 pi`

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