Kinetic Energy Calculator
Calculate the kinetic energy and momentum of any moving object. Enter mass and velocity to find KE, or solve for any variable.
Kinetic Energy Explained
The Formula
KE = ½ × m × v². Kinetic energy depends on velocity squared — doubling the speed multiplies KE by four. This is why vehicle crash safety improves dramatically at lower speeds.
Real-World Examples
A 70kg person walking at 1.4 m/s: KE = 68.6J. Same person running at 4 m/s: KE = 560J. A 1,500kg car at 30 km/h (8.33 m/s): KE = 52,000J. At 60 km/h: KE = 208,000J — four times greater.
Energy Conversion
Kinetic energy is converted to other forms on stopping: to heat (brakes, tyres), sound, and deformation. In regenerative braking systems (hybrid and electric vehicles), KE is converted back to electrical energy.
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