Kinetic energy, in simple terms, refers to the energy that an object has due to its motion. It is numerically equal to (1/2)Mv^2. Kinetic energy is a type of energy, and its unit under the International System of Units is joule (J), abbreviated as joule. It should be noted that kinetic energy (and the various works corresponding to it) are all scalars, that is, they only have magnitude but no direction. When summing, only the algebraic sum is calculated, which does not satisfy the parallelogram law of vector addition (called vector in mathematics).

Kinetic Energy Theorem

Formula: E_k = ½ mv²

Mass: m = E_k / ½ v²

Speed: v²=2E_k / m