Free Fall

Free fall: where something is falling with the effects of gravity and air resistance acting on it.

Gravity (g) = 10m/s^2 (or 9.8m/s^2 to be more precise).
.
G (gravity) =acceleration of free fall.
.
To measure g the formula is

Gravity = height of the fall x2/ time^2 (g = 2h/t^2).