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

Options

A. `51/4m^(2)//s^(2)`
B. `61/4m^(2)//s^(2)`
C. `71/4m^(2)//s^(2)`
D. `81/4m^(2)//s^(2)`

Answer

D

Explanation

`bar(C^(2))=C_("Mean")^(2)=(2^(2)+4^(2)+5^(2)+6^(2))/4=81/4m^(2)//s^(2)`