BOOM!
A cannon is defined as A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile (Wikipedia). The have long narrow "necks" that can launch a projectile a great distance. The angle of the cannon to the ground plays an important role in the distance traveled by the projectile, with 45 degrees being the greatest distance.
Newton's third law states that "With every reaction, there is an equal, opposite reaction". Therefore if the cannon has a lot of firepower, it should be constructed to withstand the opposite reaction.
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