The specific task is to find ground such that x(t) = 0 when y(t) = 0. So in other words, when the bomb lands (y=0), it hits at x=0 (directly below the point that it was dropped from). Or whatever other x we may wish for the bomb to land at. It kind of looks like that might be the second case you show.... would that method work? The syntax you show above for Optimization isn't working for me.. gives the error, "Error, (in Optimization:-NLPSolve) no improved point could be found". I'm using Maple 12 though, so maybe that's the problem? Oh, if I change 'gr=0..200,t=0..100' to 'gr=0..2000,t=0..1000', it outputs, "[1.2531600*10^7, [gr = 2000., t = 0.]]" Thanks, Paul

Ok, I got fsolve to work correctly using either one of acer's syntaxes. I also looked through both the IVP and BVP help files, and the events too, but haven't figured out any way to solve for ground. I tried to use minimize, but I can't seem to get it to work right. Any further ideas?