The angular speed of a flywheel making $120$ revolutions per minute is:

  • A
    $2\pi \, \text{rad/s}$
  • B
    $4\pi^2 \, \text{rad/s}$
  • C
    $\pi \, \text{rad/s}$
  • D
    $4\pi \, \text{rad/s}$

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