By what factor does the rms velocity of gaseous molecules increases when the temperature in kelvin is tripled?

By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?

When we place a gas cylinder on a van and the van moves, does the kinetic energy of the molecules increase? Does the temperature increase?

Does Kelvin scale have negative temperature ?

The rms velocity of gas molecules is increased from V to 3V ,when the temperature of gas molecules increases from x^(0) c to 87^(0) c.Find the value of x

At what temperature is the root mean square velocity of gaseous hydrogen molecules is equal to that of oxygen molecules at 47^(@)C