The root mean square speed of a group of gas moecules, having speeds `v_(1),v_(2),....v_(N)` is
A. `(1)/(N)sqrt((V_(1)+V_(2)+................+V_(N))^(2))`
B. `(1)/(N)sqrt((V_(1)^(2)+V_(2)^(2)+...+V_(N)^(2)))`
C. `sqrt( (1)/(N)(V_(1)^(2)+V_(2)^(2)+..+V_(N)^(2)))`
D. `sqrt((V_(1)+V_(2)+.....+V_(N))^(2))`
