Stochastic dynamics and Angular velocity of a molecular motor

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Homework Equations

Langevin equation (I included all the equations in the next section.[/B]

The Attempt at a Solution

I do not know how I can proceed from this point. I'm stuck since I have no information on the drag coefficient. Maybe my approach is wrong, and there may be another approach that lets me avoid this problem. Please help me, I will really appreciate your help !