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

By what factor does the average velocity of a gaseous molecule increases, when the temperature (tn Kelvin) is doubled ?

By what factor does the average velocity of a gaseous molecule increase when the absolute temperature is doubled ?

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

By what factor does average velocity of a gas molecule increase when temperature (in K) is doubled-

Why does the velocity of gas molecules increase with increase in temperature ?