is it possible to...

[Mudbill]

Mostly unrelated to the OP, but have you applied a force to the cannonball? If you only activate it, it will fall down because of gravity. If you want it to move forwards you can either make it into a MoveObject that travels along the X or Z axis at a high speed, or use AddPropForce("Cannonball", 0, 0, 0, "world");

The three numbers must be changed to where you want to push it. If you want it up, for example, you'd make the second number -10000 or so. The axises depend on what direction you want it to fly in. Remember to match it up with the X and Z axises in the level editor.