A wheel is rotating at $900\, r.p.m.$ about its axis. When the power is cut-off, it comes to  rest in $1\,minute$ . The angular retardation in $radian/s^2$ is:-

  • A

    $\pi / 2$

  • B

    $\pi / 4$

  • C

    $\pi / 6$

  • D

    $\pi / 8$

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