Possibly Useful Formulae
Constant acceleration:
x = x0 + v0t + at2
v = v0 + at
v2 = v02 + 2ax
Accel due to gravity = g down = 9.8 m/s2 down.
Projectile motion, with positive up:
ax = 0 (constant vx ) ;
R = ( v02 g ) sin 2
Quick and Dirty: H = gt2 and v =