Let's consider
E2f=(mc2)2+(pc)2
where the mc2 is the rest energy due to the rest mass -- in Finnish "lepomassa".
√(mc2)2+(pc)2−mc2 = (γ−1)mc2
is the kinetic energy due to the movement because of momentum p=γmv.
Now where is potential energy if Ef=γmc2 is the total energy?
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