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If a particle is within 2 m/s of the speed of light (like at CERN) and then more energy is transferred to the particle, where does this energy go? Some sources I have read talk about relativistic mass getting bigger and approaching infinity as a particle approaches 'c'. However, this source which seems reliable (as he has worked all his life in particle accelerators) says that there is no such thing as relativistic mass - it is just a useful concept to help make equations easier to work with:

So if a particle really only has one single mass and there is no such thing as relativistic mass then where does the energy go if you keep transferring it to a particle that is within 1 or 2 m/s of 'c'?

Thanks

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# B Special Relativity & Relativistic Mass

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