MotionLab

Kinetic Energy Calculator

KE = ½ · m · v², in joules.

Why velocity is squared

Kinetic energy grows with the square of velocity, not linearly — doubling a car's speed quadruples its kinetic energy, which is exactly why higher-speed collisions are so disproportionately more dangerous.

Where it's applied

Vehicle safety engineering, sports science (impact force in collisions), and basic physics problems involving falling or moving objects all use this exact formula.

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MotionLab

Kinetic Energy Calculator

KE = ½ · m · v², in joules.

Mass (kg)

Velocity (m/s)

Kinetic energy (J)

875

KE = ½ · m · v²

What you entered

Mass (kg): 70Velocity (m/s): 5

1
Square the velocity
5²= 25
2
Multiply by ½ × mass
0.5 × 70 × 25= 875

Result

Kinetic energy (J): 875

A 70kg mass moving at 5 m/s carries 875 joules of kinetic energy.

Why velocity is squared

Where it's applied

Vehicle safety engineering, sports science (impact force in collisions), and basic physics problems involving falling or moving objects all use this exact formula.