How it works
Kinetic energy E = ½mv², in joules.
Input definitions
- Mass (kg)
- Enter the value in the labeled unit.
- Speed (m/s)
- Enter the value in the labeled unit.
A worked example
- Mass (kg)
- 2
- Speed (m/s)
- 3
Assumptions & limits
Translational, nonrelativistic motion only. Speed is the nonnegative magnitude; rotational energy is excluded.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
What happens to kinetic energy when speed doubles?
At a fixed mass, kinetic energy becomes four times larger because speed is squared. Enter speed in metres per second and mass in kilograms to obtain joules.
Which units should I enter?
Use the units written in each input label. These formulas assume idealized conditions; changing to centimetres, litres or kilopascals without conversion changes the meaning of the result.
How does the Kinetic energy tool work?
Kinetic energy E = ½mv², in joules.
What are the assumptions and limits of Kinetic energy?
Translational, nonrelativistic motion only. Speed is the nonnegative magnitude; rotational energy is excluded.