what i mean is that when say, an artillery shell is fired, or a piece of debris from an explosion is launched, it goes up and away at an almost 45 degree angle until its upwards momentum is no longer sufficient to fight gravity before dropping pretty much straight down. second, given the angle of impact on the ground, could you calculate backwards from there the initial velocity and launch site of the projectile?
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It *can* go away at 45°, but it doesn’t have to. A projectile can follow a parabolic arc with an initial angle anywhere between 0° and 90°.
Edit: technically it could be fired from an elevated position with a negative angle, and still follow a parabolic arc.
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