We made cannons in class. (:
In order to maximize the range of the cannon, the angle needs to be 45.
We learned while doing projectile motion that the range of the projectile v2sin2(angle)/g.
Since sin90 is 1, and we want everything maximized, in order to get 1, the angle needs to be 45 because sin2(45) = sin90. (:
Even though that isn't a cannon, it is a projectile. (:
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