Kinetic Energy Calculator
Calculate kinetic energy, mass, or velocity using E = ½mv².
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How kinetic energy is calculated
This kinetic energy calculator uses mass and velocity to calculate kinetic energy, or rearranges the formula to solve mass or velocity. It is useful for physics class, motion analysis, vehicle speed, collision concepts, and basic mechanics.
Kinetic energy is proportional to velocity squared. If speed doubles, kinetic energy becomes four times larger, which is why high-speed motion matters in safety and engineering.
Formula or logic
- Kinetic energy E = 1/2 × m × v²
- Mass m = 2E ÷ v²
- Velocity v = √(2E ÷ m)
Example
If a 2 kg object moves at 3 m/s, its kinetic energy is 9 J. If the speed increases to 6 m/s, the kinetic energy becomes 36 J.
Common questions
What unit is kinetic energy measured in?
The SI unit is the joule, J.
Can kinetic energy be negative if velocity is negative?
No. Velocity is squared in the formula, so kinetic energy is not negative.
Is kinetic energy the same as momentum?
No. Kinetic energy depends on velocity squared, while momentum depends on velocity to the first power.