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The Lorentz transformation m’ = M/√1-v^{2} /c^{2} is a principle of measurement that can be classed as one of the laws of physics. (A moving body’s kinetic mass m’ is equal to its rest mass M divided by the square root of one minus the Lorentz velocity squared v^{2} divided by the speed of light squared c^{2} ). It comes into play whenever a body of mass undergoes measurable acceleration or deceleration.