Kinetic Energy Calculator
Calculate classical translational kinetic energy from mass and speed.
Formula
K = mv²/2; m in kg, v in m/s.
Mass: 2 kg · Speed: 3 m/s · Kinetic energy ≈ (2 kg)×(3 m/s)^2÷2
How to use
- Enter the object’s mass.
- Enter its speed in your chosen frame.
- Read kinetic energy in joules.
Examples
- 2 kg moving at 3 m/s has 9 J of kinetic energy.
Frequently asked questions
Does direction matter?
No. Speed is the magnitude of velocity and energy is a scalar.
Is rotation included?
No. Rotational energy needs moment of inertia and angular speed.
Can I use it near light speed?
No. This classical equation is an approximation for speeds much lower than light speed.
Sources
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