Projectile motion which is used more in archery and artillery can give you a better idea, but the height does matter and air resistance matter.
For the angle at level to get your attention:pi/2  (CC does not handle symbol from word/2-see: https://en.wikipedia.org/wiki/Trajectory_of_a_projectile
For different heights; https://www.usna.edu/Users/physics/mungan/_files/documents/Scholarship/Projectile.pdf