Question

The different molecules that make up the air in a room have on average the same kinetic energy. How does the speed of the different air molecules depend on their masses?
(I accidentally put this under the wrong subject)

Answer 1

The formula for kinetic energy is KE=1/2(mv²).  Since both mass and velocity are multiplied by each other, particle with a larger mass needs to be moving slower than a particle with less mass if both have the same kinetic energy. You can think of it as 2KE/m=v² or 2KE/v²=m, If you increase the mass the velocity needs to decrease to keep the same KE value.

I hope this helps.  Let me know in the comments if anything is unclear.