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What does the special theory of relativity say about mass?

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According to the special theory of relativity, mass is not strictly constant but increases with the speed according to the formula m = m0 / 1- v2 / c2 , where m0 is the rest mass of the body, v is its speed, and c is the speed of light in vacuum. This increase in mass, however, does not become appreciable until very great speeds are reached. The rest mass of a body is its mass at zero velocity ...

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Similar questions: When is the rest mass of a body? Does mass increase in a vacuum? Can mass increase with speed? [ Hide these questions ]

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