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THE **kinetic energy** is the energy associated with **velocity** of a body. If there is speed, there will certainly be that kind of energy. For objects that are at rest, the kinetic energy is zero, as the velocity of such bodies is zero.

**Determination of kinetic energy**

kinetic energy **is determined as a function of body mass **in motion, which is measured in kilograms (kg), **and the speed** developed by it, which is determined in meters per second (m/s).

The unit of measure adopted by the **International System of Units (SI)** for kinetic energy it is joule (J). This unit is a tribute to the English physicist **James Prescott Joule** for their contributions to studies relating to the **heat** and to energy. See correspondence between joule (J) and calorie (cal) units:

**1 cal = 4.2 J**

**Relationship between kinetic energy and work**

**Work** is the amount of energy expended in performing a certain activity and is **defined broadly as the product of the force applied to an object and the displacement suffered by it.** When a force is applied in favor of an object's movement, there will be increased speed and consequent increase in kinetic energy, therefore, we can establish a relationship between energy kinetics and

**work**. The call

**Kinetic Energy Theorem**

**shows that the work done on an object is just equal to the change in kinetic energy suffered by it.**

By Joab Silas

Graduated in Physics

**Source:** Brazil School - https://brasilescola.uol.com.br/o-que-e/fisica/o-que-e-energia-cinetica.htm