Free Fall Energy Calculator
From mass and drop height, compute potential energy, kinetic energy at impact, and impact speed.
Last updated:
Input
Enter the mass and drop height to compute potential energy, kinetic energy at impact, and impact speed.
kg
Enter the mass of the falling object.
m
Enter the height from which the object is dropped.
Gravity uses the standard value g = 9.80665 m/s squared.
Result
Potential energy (equals kinetic energy at impact)
196.133J
Impact speed
14.004749 m/s
Impact speed (per hour)
50.417097 km/h
Potential energy
196.133 J
Kinetic energy
196.133 J
Potential energy U = m g h, impact speed v = sqrt(2 g h). By energy conservation, the kinetic energy K at impact equals U (air resistance ignored).
How it works
- Potential energy is U = m g h [J], measured with the ground as the zero reference.
- Ignoring air resistance, conservation of energy makes the kinetic energy just before impact equal to the potential energy (K = U).
- Impact speed is v = sqrt(2 g h) [m/s] and does not depend on mass.
- Gravity is taken as the standard value g = 9.80665 m/s squared.
- Speed in km/h is v_kmh = v times 3.6 [km/h].
Reviews
Tell us what you think of this calculator.
Write a review
Found an incorrect result or a problem? Turn this on to report it.
Rating