'projectile from height:

Pi = 3.14159265359
' Pi must be the irrational number 3.14159265359....
'
g = 10
' g is gravity acceleration
'
'
h = 2
' h is the height of the shooting
'
'
v0 = 5
' V0 is the initial velocity (speed)
'
'
an = 45 * Pi / 180
' an is the angle of release of the projectile
'
'
a = (1 + (Tan(an)) ^ 2) * g / (2 * v0 ^ 2)
b = -Tan(an)
c = -h
'
' a, b and c are the constants of the resulting quadratic equation
'
x1 = (-b + Sqr(b ^ 2 - 4 * a * c)) / (2 * a)
x2 = (-b - Sqr(b ^ 2 - 4 * a * c)) / (2 * a)
' x1 and x2 are the soolutions of the quadratic equation
'
'
MsgBox x1
MsgBox x2