3 ms·

So basically we have rest mass and relativistic mass. How those two compare? And when we say: energy - mass equivalence we actually mean energy - relativistic m

So basically we have rest mass and relativistic mass. How those two compare? And when we say: energy - mass equivalence we actually mean energy - relativistic mass equivalence?

YayamiOmate 7y ago
No. You gotta be extra careful when you introduce relativistic mass. Photon has momentum, zero rest mass. Energy mass equivalence says that you can annihilate mass to create a massless particle. This is true for all the observers. Relativistic mass is a perceived mass dependent on the observer.