the so-called kinetic energy simply refers to the energy an object has due to motion. 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), referred to as joule. it should be noted that kinetic energy (and the various work corresponding to it) are all scalar quantities, that is, they only have magnitude but no direction. when summing, only the algebraic sum is calculated, and the parallelogram rule for addition of vectors (called vectors in mathematics) is not satisfied.

kinetic energy theorem

formula: e_k = ½ mv²

mass: m = e_k / ½ v²

speed:v²=2E_k / m