A projectile is launched with speed

at an angle

above the horizontal. The launch point is at a height h above the ground.

Show that if air resistance is neglected, the horizontal distance that the projectile travels before striking the ground is:

Verify that if the launch point is at ground level so that h = 0 this is equal to the horizontal range R =

(derived from the example in my texbook)

Ok.....

the projectile is the first case and the second case is the angle below h ...

and im very confused at which equations to gather here:

t" alt="x = V_{o}\cos{\alpha_o}

t" />

alpha_o is initial angle

help needed for physics pros here (Especially topsquark)