Why does a cannon recoil after firing ?

Conservation of energy
Backward thrust of gases produced
Newton’s third law of motion
Newton’s first law of motion
Newton’s third law of motion  In technical terms, the recoil is a result of conservation of momentum, as according to Newton’s third law the force required to accelerate something will evoke an equal but opposite reactional force, which means the forward momentum gained by the projectile and exhaust gases will be mathematically balanced.

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