Bungee jumping dynamics assignment

Homework Statement

A formula has been determined: d=l+h+ (l(SRT(m(m+150))+m)/75), where d is the depth jumped to, l is the length of the rope, h is the height of the jumper and m is the mass of the person. The question is:
At present, the model does not include air resistance. Show and discuss all changes that would have to be made to the model to include air resistance, which is proportional to the velocity of the jumper.

b. Discuss the difficulties involved with the mathematics of this model.

The Attempt at a Solution

I'm supposed to determine a constant of air resistance (which I have called b) from the information that Air resistance (which I have called J): is proportional to: velocity but I'm so stuck I have no direction

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