The Theory of Relativity and the Speed of Light
γ is the Lorentz factor, which is a scale factor that shows up repeatedly in relativity. It indicates the change in different quantities, such as mass, length, and time, when objects are moving. Since γ = 1 / / square root of (1 - v 2 /c 2), this is what causes the different look of the two equations shown.; m 0 is the rest mass of the object, obtained when it has a velocity of 0 in a given ...
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