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## Homework Statement

Felix, a Red bull skydiver, (mass m) who drops out of a hovering helicopter, falls long enough without a parachute(so the drag force has strenght kv

^{2}) to reach his first terminal velocity ( denoted v1). When his parachute opens, the air resistance force has a strenght Kv.

At what minimum altitude must his parachute open so that he slows to within 1% of his new

(much lower) terminal velocity (v2) by the time he hits the ground?

## Homework Equations

newtons second law F = ma

## The Attempt at a Solution

I used newton second law of motion and think i have to use the time t = 0 and not sure what to do again could someone help me