A cannonball is fired with velocity `v` . At what angle must the cannonball be fired in order for it to hit an enemy that is at the same elevation, but a distance `d` away?

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The acceleration of gravity is 9.8m/s2, meaning that you would need to calculate the travel time between the two points at the given velocity and compensate for that so that the elevation is zero when the cannonball is at the enemy's position. 

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