The speeds of four particles are $2, 3, 4,$ and $5 \, cm/s$ respectively. What will be their $rms$ speed?

  • A
    $3.5 \, cm/s$
  • B
    $\sqrt{\frac{27}{2}} \, cm/s$
  • C
    $\sqrt{54} \, cm/s$
  • D
    $\frac{\sqrt{54}}{2} \, cm/s$

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