It depends on the weapon. A rifle will have a very low angle--maybe ten degrees. A mortar needs a very high angle to give a good range. And a howitzer needs about a 45 degree angle to give long range.
The path of this projectile launched from a height y0 has a range d.In physics, a projectile launched with specific initial conditions in a uniform gravity field will have a predictable range. As in...
Without considering any effects of air resistance and wind, the angle of projection that delivers the greatest horizontal range is 45 degrees above the horizon. Anything different ... either more or...
Sure. -- Pick any number less than 45. -- Add your number to 45 degrees. That's one of them. -- Subtract your number from 45 degrees. That's the other one. (As usual for this kind of discussion,...