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A fan is switched on and it accelerates ...

A fan is switched on and it accelerates at a constant angular acceleration of `2 rad//s^(2)` till it attains an angular velocity of `18 rad//s`. At this instant power is switched off, Assuming there is no dissipative force, the angular displacement made by it in `20` seconds is

A

`64`radians

B

`44.4` revolutions

C

`279` radians

D

`400` revolutions

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