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Four molecules have speeds 2 km//s, 3 km...

Four molecules have speeds `2 km//s, 3 km//s, 4 km//s` and `5 km//s`. The `rms` speed of these molecules in `km//s` is

A

`sqrt(54//4)`

B

`sqrt(54//2)`

C

3.5

D

`3sqrt(3)`

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