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If angular velocity of a disc depends an...

If angular velocity of a disc depends an angle rotated `theta` as `omega=theta^(2)+2theta`, then its angular acceleration `alpha` at `theta=1` rad is :

A

`4" rad/s"^(2)`

B

`10" rad/s"^(2)`

C

`12" rad/s"^(2)`

D

`15" rad/s"^(2)`

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