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A circular disk of radius $R$, initially at rest, starts spinning with a constant angular acceleration of $\alpha$.

The angular speed of the disk after it completes $1$ revolution is

A

$ \sqrt {2 \alpha} $

B

$ \sqrt {2\pi \alpha} $

C

$ 2\sqrt {\pi \alpha} $

D

$ 4\sqrt {\pi \alpha} $

E

$ \sqrt {\pi \alpha} $

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