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Four molecules of a gas have speed 1, 2,...

Four molecules of a gas have speed `1, 2, 3 and 4 km s^(-1)` respectively. The value of rms speed of the molecules is (in `km s^(-1)`)

A

`sqrt((15)/(2))`

B

`2 sqrt(15)`

C

`(sqrt(15))/(2) `

D

None of the above

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