Free Fall Formula
Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling. Velocity is defined as gravity x time.
h = 1/2gt2, m
v = gt, m/s
Free Fall Formulas Questions:
1) You're standing at the edge of a cliff and drop a ball. It takes 10 sec to hit the ground. How high up are you?
Answer: You know that gravity, g = 9.8 m/s2, and time, t = 10 sec.
h = 1/2 gt2
h = 1/2 (9.8 m/s2) X (10 sec)2
h = 490 m
2) What was the velocity of the ball?
Answer: you know that gravity, g = 9.8 m/s2 and time, t = 10 sec
v = gt
v = 9.8 m/s2 x10 sec
v = 98 m/s