Calculateur d'Énergie Cinétique Gratuit
Calculez l'énergie cinétique à partir de la masse et de la vitesse. Calculateur de physique gratuit.
kg
m/s
Kinetic Energy
3,500.00 J
Kinetic Energy (kJ)3.5000 kJ
Kinetic Energy vs Mass
Formule
## Kinetic Energy Kinetic energy is the energy an object possesses due to its motion. ### Formula **KE = (1/2) * m * v²** Because velocity is squared, doubling speed quadruples kinetic energy.
Exemple Résolu
A 70 kg sprinter runs at 10 m/s.
- 01KE = 0.5 * m * v²
- 02KE = 0.5 * 70 * 10²
- 03KE = 0.5 * 70 * 100
- 04KE = 3500 J = 3.5 kJ
Questions Fréquentes
What is the unit of kinetic energy?
The SI unit is the joule (J). One joule equals one kilogram meter squared per second squared (kg·m²/s²).
Why does doubling speed quadruple kinetic energy?
Because velocity is squared in the formula. If v doubles, v² quadruples, so KE quadruples.
Is kinetic energy always positive?
Yes. Mass is positive and v² is always non-negative, so kinetic energy is always zero or positive.
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