When a cannon is fired, how does the size of the force of the cannon on the cannonball compared with the force of the cannonball on the cannon?

The force applied to the cannonball and cannon is equal. The explosion inside the cannon will generate a pressure which will turn into a force on both cannonball and cannon. The cannon being heavier and fixed to the ground will move a bit, but the cannonball will be thrown away, fired.

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