Will a connon ball work in space?

Yes, a cannonball will work in space, but its behavior will be different from that on Earth. In the vacuum of space, there is no air resistance, so once fired, the cannonball would continue to travel indefinitely in a straight line until acted upon by another force, like gravity from a nearby planet or celestial body. However, without an atmosphere, the cannon would not function as it does on Earth, as there would be no combustion to create the necessary pressure to propel the projectile.