Quote Originally Posted by Kyle Cactus View Post
The arc formula mentioned in an earlier post assumes a circular arc. A thrown ball will have a more elongated trajectory on the way up, but it will come down more steeply since it loses lateral velocity due to air resistance. It still may be good enough for an approximate answer, but to do it right you'll probably need some physics and calculus. Yuck!
Linky for calculating a trajectory: http://en.wikipedia.org/wiki/Trajectory

Good luck with this one! I'm not gonna attempt it.