Free Fall Time from 15 meters - How Long to Fall?
Dropping an object from a height of 15 meters in vacuum results in an elapsed fall time of 1.749 seconds and a terminal impact speed of 17.15 m/s (approx. 61.7 km/h or 38.4 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 15 m.
Drop Time Comparison Across Solar System (15.0m 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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15m 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 | 1.749 s | 61.8 km/h | 686.7 N (70.0 kg) |
Moon | 1.62 m/s² | 4.303 s | 25.1 km/h | 113.4 N (11.6 kg) |
Mars | 3.71 m/s² | 2.844 s | 38.0 km/h | 259.7 N (26.5 kg) |
Jupiter | 24.79 m/s² | 1.100 s | 98.2 km/h | 1735.3 N (177.0 kg) |
Venus | 8.87 m/s² | 1.839 s | 58.7 km/h | 620.9 N (63.3 kg) |
Mercury | 3.7 m/s² | 2.847 s | 37.9 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 15 meters on Earth?
In a vacuum under standard Earth gravity (g = 9.80665 m/s²), an object dropped from rest takes exactly 1.749 seconds to fall 15 meters, calculated via t = √(2h / g).
Q2.What is the impact velocity from a 15m drop?
At ground impact after falling 15m, the object reaches a velocity of 17.15 m/s, which equals 61.7 km/h (38.4 mph).
Q3.How does free fall from 15m compare on the Moon vs Jupiter?
On the Moon (g = 1.62 m/s²), falling 15m takes 4.30 seconds. On Jupiter (g = 24.79 m/s²), the same fall takes just 1.10 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.