Kinetic energy, form of energy that an object or a particle has by reason of its motion. The electron volt is used on the atomic and subatomic scales. ![]() The unit in the centimetre-gram-second system is the erg, 10 −7 joule, equivalent to the kinetic energy of a mosquito in flight. A 2-kg mass (4.4 pounds on Earth) moving at a speed of one metre per second (slightly more than two miles per hour) has a kinetic energy of one joule.
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