1. The problem statement, all variables and given/known data I need something like the equations of motion, but accounting for drag as given by the http://en.wikipedia.org/wiki/Drag_equation" [Broken]. Particularly for: 2. Relevant equations [tex]& v && = v_0+at \qquad[/tex] [tex]& s && = s_0 + v_0t + \tfrac12 at^2 \qquad[/tex] 3. The attempt at a solution I have racked my brains for hours on this but can't make any progress. Google doesn't seem to be giving me much either (at least with my search terms). I am not formally educated in physics at all so there might be some obvious solution that I am missing. I've tried to work out velocity by calculating drag and acceleration as a series of updates and seeing if it approaches any sort of useful value, but no matter what I try the equations always end up approaching either 0 or v0+at when I increase the frequency of the updates. This isn't really a homework assignment, but this seems to be the only part of the forums suitable for these sorts of questions. Assistance would be really appreciated.