Four molecules of gas have speeds 1,2,3 ...

Four molecules of gas have speeds 1,2,3 and 4 `km//s`.The value of the root mean square speed of the gas molecules is

`(1)/(2) sqrt(15)` km/s

`(1)/(2) sqrt(10)` km/s

`2.5` km/s

`sqrt((15)/(2))` km/s

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