Kinetic Energy Calculator (½mv²)
Translational kinetic energy of a moving body from its mass and speed.
Result
Kinetic Energy (KE)
100 J
In kilojoules
0.1 kJ
Mass
2 kg
Velocity
10 m/s
Concept
Kinetic energy is the energy a body possesses due to its motion. It is a scalar quantity — always non-negative.
The v² dependence means doubling speed quadruples kinetic energy — this is why road speed limits matter so much for crash energy.
Work-Energy theorem: the net work done on a body equals its change in kinetic energy. KE is measured in joules (J = kg·m²/s²).
Formula
KE=12 × m × v2
v=√2 × KE ÷ m
Variables
KEJ = kg·m²/s²- Kinetic energy.
mkg- Mass of the body.
vm/s- Speed of the body — use the magnitude of the velocity vector.