# Energy Problem (Systems and Energy Conversion)

## 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