 where \(\gamma(v)\) is to so-called “Lorentz factor.” This total energy \(E\) differs from the rest energy \(E_o\) for any object that moves with some velocity \(v\) relative to a given inertial frame. In such an inertial frame, an object will have a non-zero relativistic kinetic energy and its total energy \(E\) is given by the equation above. In the inertial frame in which such an object is at rest, however, the value of \(\gamma(v)\) becomes 1 and the total energy is equal to the rest energy \(E_o\), one might say, precisely because in that inertial frame the object’s relativistic kinetic energy is zero. 