SpudFiles

unless you took your cannon up in a skydiving plane, then went to the maximum altitude possible in that plane, then shot the gun straight up, and the projectile had a parachute. . no, I'm kidding, but gort, how do you figure these things out. I mean, I'm a freshman, and am in honors classes, and am taking geometry, so I'm not stupid, but how do you figure these things out?

10 minutes up then down = 5 minutes up.
5 minutes = 300 seconds
300 seconds * 32 f/s/s = 9,600 f/s
9,600/1100 = mach 8.7

That, unless I'm ignoring some possibility, is (roughly) the lowest velocity that can give you that hang time.
It assumes a drag-free projectile.

Or, at least, when using a dumb object.
Projectiles with lifting surfaces (wings) or parachutes are a different thing altogether.

Yeah, what he said.

Thanks BLB, I really didn't feel like typing that stuff out. There's more that you should really show, but let's hope he accepts your explanation as it is.

sgort, how did you figure that out?... I would like to find out how fast my cannon shoots