Why does doubling speed quadruple kinetic energy?

Because velocity is squared in the formula. KE ∝ v². At 20 m/s vs 10 m/s: (20²)/(10²) = 400/100 = 4× more energy. This is why highway collisions are so much more severe than parking lot fender-benders.

How much kinetic energy does a car have at 60 mph?

A 3,000 lb (1,360 kg) car at 60 mph (26.8 m/s) has KE = ½ × 1360 × 26.8² ≈ 488,000 J (488 kJ) — equivalent to detonating about 120 grams of TNT.

Kinetic Energy Calculator

The Kinetic Energy Calculator computes the energy an object possesses due to its motion using the formula KE = ½mv². Double the velocity and kinetic energy quadruples — making speed the dominant factor in collisions. This calculator is used in physics, engineering, sports science, and accident reconstruction.

Unit System

Mass (kg or lbs)

Velocity (m/s or mph)

How to Use This Calculator

1
Select your unit system (SI or Imperial).
2
Enter the mass of the object.
3
Enter the velocity.
4
Click Calculate for kinetic energy in Joules or foot-pounds.

Frequently Asked Questions

Kinetic energy is the energy an object has because it's moving. KE = ½mv², where m is mass in kg and v is velocity in m/s. Result is in Joules (J).

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