root mean squared velocity (Urms) vs velocity in KE equation

[JKMBC]

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What's the difference between the velocity described in the equation KE=1/2mv^2=3/2*Kb*T and the root mean squared velocity Urms=sqrt(3RT/M)?

Can you use both to find the most like velocity of a given gas particle?

I thought about this while working on Kaplan FL #5, it was in the Chem/Phys section, question #44.

Thanks!!