If a gas contains only three molecules that move with velocities of $100, 200, 500 \ ms^{-1}$. What is the $rms$ velocity of that gas in $ms^{-1}$?
- A$100 \frac{\sqrt{8}}{3}$
- B$100 \sqrt{30}$
- C$100 \sqrt{10}$
- D$\frac{800}{3}$
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