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A wheel rotating at angular speed of 20r...

A wheel rotating at angular speed of `20rads^(-1)`, is brought to rest by a constant torque in 4s. If the M.I is `0.2kgm^(2)`, the work done in first `2s` is

A

`50J`

B

`30J`

C

`20J`

D

`10J`

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The correct Answer is:
B
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