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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^(3)+2theta^2`, then its angular acceleration `alpha` at `theta=1` rad is :

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The correct Answer is:
D
`l=6 cm, v=?, omega=(2pi)/60=pi/30 rad//s`
So `v=omegal=pi/30xx6=pi/5 cm//s=2pi mm//s`
Difference `=sqrt(2) pi/5 cm//s=2sqrt(2) pi mm//s`
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