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Four molecules have the velocities 3 xx ...

Four molecules have the velocities `3 xx 10 cms^(-1), 4 xx 10^4cms^(-1), 2 xx 104cms^(-1)`  and `5 xx 10^4cms^(-1)`.. Find the RMS velocity of the molecules. 

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`3.685 xx 10^(4) cms^(-1)`
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