Four molecules of a gas have speeds 2, 4...

Four molecules of a gas have speeds `2, 4, 6` and `8 kms^(-1)` respectively. Calculate their average speed and root mean square speed.

A

`sqrt(30)m//s`

B

`120m//s`

C

`2sqrt(30)m//s`

D

`60m//s`

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The correct Answer is:

A

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