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If an electric fan revolving at 600 rpm ...

If an electric fan revolving at 600 rpm isspeeded up uniformly to 1200 rpm in 4 s, then the angular acceleration of the fan will be

A

`pi//2 rad//s^2`

B

`2 pi rad //s^2`

C

`3 pi//2 rad //s^2`

D

`5pi rad//s^2`

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