Distinguish between average speed and rms speed. If three molecules have speed `u_(1), u_(2), u_(3)` what will be their average speed and rms speed.

Explanation

Average speed is the arithmetic mean of the speeds of the molecules.
`:.` Average speed = `(u_(1)+u_(2)+u_(3))/(3)`
rms speed is the root mean square and is define as the square root of the mean of the wquares of different speeds of the individual molecules.
rms speed = `sqrt((u_(1)^(2)+u_(2)^(2)+u_(3)^(2))/(3))`.