# Differential Equations - Elementary Application

Submitted by agentcollins on August 31, 2016 - 11:01pm

A parachutist is falling with speed 176 ft/s when his parachute opens. If the air resistance is Wv2/225 lb where W is the total weight of the man and the parachute and v is in ft/s, find his speed as a function of time after the parachute opens.

If I use the suvat equations, the given resistance is the value of my what? Or I can't use the suvat equations at all?

If I use Fresultant=Fapplied-Fresistance. I can substitute the given resistance, but what would be the value or formula for getting my Fresulant and Fapplied?

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## I think ... you'll use the

I think ... you'll use the concept of free fall?

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