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Derive an equation for k using the weight of a bungee jumper (170 lbs) the unstretched length of the cord (unknown) and the height of the dam from which the jumper is jumping off of (722 ft)

What I have come up with is:

K=(170lbs*32.2ft/sec^2)/722ft

K=7.58lb ft/sec^2

Is this correct?

What would be the unstretched length of the cord so that the jumper has a speed of 0 when at the bottom of the jump?

If k=7.58, then the unstretched length should be

L=722/7.58

L=95.25

This does not seem possible........