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A fly wheel revolves at 100 rev//min, a ...

A fly wheel revolves at `100 rev//min`, a torque is applied to the flywheel for 10s. If the torque increases the speed to `200 rev//min`, then the angular acceleration of the fly wheel will be

A

`pi/6 rad s^-2`

B

`pi/5 rad s^-2`

C

`pi/3rad s^-2`

D

`pi/3rad^-2`

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