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The velocities of 4 molecules are 2 m//s...

The velocities of 4 molecules are `2 m//s`, `4 m//s`, `5 m//s` and `6 m//s` respectively. What is their mean square velocity?

A

`51/4m^2/s^2`

B

`61/4m^2/s^2`

C

`71/4 m^2/s^2`

D

81/4m^2/s^2`

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