Free Fall Time from 80 meters - How Long to Fall?
Dropping an object from a height of 80 meters in vacuum results in an elapsed fall time of 4.039 seconds and a terminal impact speed of 39.61 m/s (approx. 142.6 km/h or 88.6 mph).
Calculations are derived from classical Newtonian kinematics (h = ½ · g · t²) under standard Earth gravitational acceleration (g = 9.80665 m/s²).
Free Fall Drop Time & Impact Velocity
Classical Newtonian Kinematics in Vacuum (NIST Reference CODATA)
Elapsed duration for an object to reach ground in vacuum from 80 m.
Drop Time Comparison Across Solar System (80.0m Drop)
t ∝ 1/√gskymotion20-20).Recommended Classical Mechanics & Physics Literature
Hand-selected peer-reviewed literature, optical instruments, and mechanics resources verified by physics educator Traian Anghel.
The Feynman Lectures on Physics, Vol. 1
By Richard Feynman, Robert Leighton & Matthew Sands. Mechanics, radiation, kinetics, and heat.
Classical Mechanics by John R. Taylor
Clear, rigorous pedagogical treatment of Newton's laws, kinematics, momentum, and orbital mechanics.
Physics for Scientists and Engineers
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80m Drop Time & Weight Across the Solar System
| Celestial Body | Surface Gravity (g) | Fall Duration (t) | Impact Velocity (km/h) | 70kg Person Weight |
|---|---|---|---|---|
Earth | 9.81 m/s² | 4.039 s | 142.6 km/h | 686.7 N (70.0 kg) |
Moon | 1.62 m/s² | 9.938 s | 58.0 km/h | 113.4 N (11.6 kg) |
Mars | 3.71 m/s² | 6.567 s | 87.7 km/h | 259.7 N (26.5 kg) |
Jupiter | 24.79 m/s² | 2.541 s | 226.7 km/h | 1735.3 N (177.0 kg) |
Venus | 8.87 m/s² | 4.247 s | 135.6 km/h | 620.9 N (63.3 kg) |
Mercury | 3.7 m/s² | 6.576 s | 87.6 km/h | 259.0 N (26.4 kg) |
Explore Other Kinematics & Motion Calculators
Frequently Asked Questions
Q1.How long does it take an object to fall 80 meters on Earth?
In a vacuum under standard Earth gravity (g = 9.80665 m/s²), an object dropped from rest takes exactly 4.039 seconds to fall 80 meters, calculated via t = √(2h / g).
Q2.What is the impact velocity from a 80m drop?
At ground impact after falling 80m, the object reaches a velocity of 39.61 m/s, which equals 142.6 km/h (88.6 mph).
Q3.How does free fall from 80m compare on the Moon vs Jupiter?
On the Moon (g = 1.62 m/s²), falling 80m takes 9.94 seconds. On Jupiter (g = 24.79 m/s²), the same fall takes just 2.54 seconds due to its immense gravitational acceleration.
skymotion20-20).Recommended Classical Mechanics & Physics Literature
Hand-selected peer-reviewed literature, optical instruments, and mechanics resources verified by physics educator Traian Anghel.
The Feynman Lectures on Physics, Vol. 1
By Richard Feynman, Robert Leighton & Matthew Sands. Mechanics, radiation, kinetics, and heat.
Classical Mechanics by John R. Taylor
Clear, rigorous pedagogical treatment of Newton's laws, kinematics, momentum, and orbital mechanics.
Physics for Scientists and Engineers
By Raymond A. Serway & John W. Jewett. Comprehensive kinetic energy, work, and friction mechanics.