**Energy–momentum relation - Wikipedia**
https://en.wikipedia.org/wiki/Energy%E2%80%93momentum_relation

1) This equation holds for a body or system , such as one or more particles , with total energy E , invariant mass m 0 , and momentum of magnitude p ; the constant c is the speed of light . It assumes the special relativity case of flat spacetime . Total energy is the sum of rest energy and kinetic energy , while invariant mass is mass measured in a center-of-momentum frame . For …

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