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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=1/2mv

^{2}

Potential Energy --- PE=mgy ... g=9.8 m/s

^{2}

Work --- W=Fd