Energy Problem (Systems and Energy Conversion)

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Homework Statement


At what height should a parachute be opened so the final speed is 5.00 m/s. (The parachuter is 80.0 kg. He jumps off a balloon at 1,000 m. The total retarding force on the man is constant at 50.0 N with the parachute closed and constant at 3,600 N with the parachute open.)


Homework Equations


Kinetic Energy --- KE=1/2mv2
Potential Energy --- PE=mgy ... g=9.8 m/s2
Work --- W=Fd


The Attempt at a Solution

 

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ehild
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