A 460 kg cannon fires a 12 kg cannonball with a speed of 200 m/s relative to the muzzle. The cannon is on wheels that roll without friction.

A 460 kg cannon fires a 12 kg cannonball with a speed of 200 m/s relative to the muzzle. The cannon is on wheels that roll without friction. When the cannon fires, what is the speed of the cannonball relative to the earth?