E=mc ² is not the complete equation

Man, you got to love Minute Physics. Being too lazy and accepting many formulae like they were laws, when they are only a part of the whole, leads us to ignorance. Minute Physics explainws why E=mc ² is only a partof Einstens equation. Awesome.

The full equation is E ²=(mc ²) ²+(pc) ². For an object that is not moving, thus p – momentum – being zero we get E=mc². If an object is moving then we get the full equation. Also, if an object is masless, like the photons, then you get their energy as being E=(pc).

Other sources:
Q: What does “E=mc2” mean?

Also, here is another explanation from Dr. Don, from Fermilab:

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