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Homework Statement
A 70.0 kg person steps through the window of a burning building and drops to a rescue net held 8.00 m below. If the surface of the net is 1.40 m above the ground, what must be the value of the spring constant for the net so that the person just touches the ground when the net stretches down.
Homework Equations
How do I find the velocity of the man falling?
The Attempt at a Solution
Eg + Ee + Ek = Eg' + Ee' + Ek'
Eg + Ek = Ee'
mgh + .5mV2 = .5kx
(70)(9.8)(9.4) + .5(70)V2 = 0.5k(1.4)2