- #1

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I've seen on Wikipedia (http://en.wikipedia.org/wiki/Airsoft_pellets#pellet_ballistics) a formula to find the aerodynamic drag (velocity dependent negative acceleration) for a spherical body. Knowing body's mass, diameter and air density I simplified it to the form:

A = v

_{t}

^{2}* 0.04

where

*A*is the drag,

*t*is a point in time,

*v*is the instantaneous velocity at

_{t}*t*.

The problem comes now: how can I get

*v*at arbitrary times or distances?

_{t}*A*changes in instants of time so I can't do a simple

*v*

_{t}= v_{0}+ A * tSay the ball has an initial

*v*= 120m/s; what's the velocity at

_{0}*t*= 1s?