A rigid body rotates about a fixed axis with variable angular velocity equal to $(\alpha \,-\,\beta t)$ at time $t,$ where $\alpha $ and $\beta $ are constants. The angle through which it rotates before it comes to rest is

  • A

    $\frac {\alpha ^2}{2\beta }$

  • B

    $\frac{{{\alpha ^2} - {\beta ^2}}}{{2\alpha }}$

  • C

    $\frac{{{\alpha ^2} - {\beta ^2}}}{{2\beta }}$

  • D

    $\frac{{\alpha (\alpha  - \beta )}}{2}$

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