Fuses ans stuff was : Lightbulb police?

Oh, it was wore thsn that. The projectile motion always invovled a parabolic trajectory. This assumes not only zero air resistance, but also uniform gravity acting vertically downwards -- in other words a flat earth. Which I don't believe in. There is nothing wrong with approxiamtions, of course. Although Newtonian mechanics is an approxiation to special relativity, I have no problem using hte former to work out what will happen to normal-sized objects moving at normal speeds. What annoyed me about applied maths was the _major_ approximationnts oyu made, which then resulted in some nasty-looking equaitons that you had to integrate analyitcally. The point being that if you'd integrated them numerically, the errors from that would have been much less than the errors introuced by the approximations, and becuase the equations _were_ based on approximations there was little point in fionding he analytic forom of the answer, it didn't really tell you how the system would really behave. No it was a silly game to get you to solve equations. -tony