| Definition: | for a particle, its mass when moving in an inertial frame NOTE 1 A particle with rest mass m0 and speed v has a relativistic mass equal to m0/√1−v2/c20, where c0 is speed of light. When the speed v is non-zero, the relativistic mass is greater than the rest mass. NOTE 2 In the theory of relativity, the term “mass” generally means relativistic mass.
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