Example 1
A 1,500 kg car moving at 20 m/s has 300 kJ of kinetic energy. Doubling the speed to 40 m/s multiplies that energy by four, to 1.2 MJ.
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Physics tools › Kinetic energy calculator
Mendeleev · Physics
Kinetic energy calculator
Kinetic energy is the energy an object has because it is moving. It grows in direct proportion to mass, but with the square of speed.
Formula usedKE = ½mv²
Calculate
Kinetic energy calculator
What do the symbols mean?
KEkinetic energy
mmass
vspeed
Two worked examples
Example 2
For a 0.145 kg baseball at 40 m/s, KE = ½ × 0.145 × 40² = 116 J. The calculator can also reverse the relation to find the speed from a measured energy.
Good to knowIn English-language physics, kinetic energy is commonly written KE.