The Wiki article https://en.wikipedia.org/wiki/Mass_in_special_relativity seems to advise "don't use the expression 'relativistic mass'; stick to 'relativistic momentum' pγ". So what does one do if Alice were to measure Bob's mass while Bob is traveling at velocity v with respect to Alice, and Alice wants to compare her measurement to his rest mass that she happens to know. Would one say that Alice can't measure Bob's mass directly; that she could only measure his momentum?(adsbygoogle = window.adsbygoogle || []).push({});

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# I "relativistic mass" still a no-no?

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