A wheel is of diameter $1\ m.$ If it makes $30$ revolution per second, then the linear speed of a point on its circumference will be 

  • A

    $30\,\,\pi \,\,\,m/s$

  • B

    $\pi \,\,\,m/s$

  • C

    $60\,\,\pi \,\,\,m/s$

  • D

    $\frac{\pi }{2}\,\,\,m/s$

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