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**Problem Statement:**Trying to understand the principles for the equation e=mc2.

**Relevant Equations:**E=mc2

So just started at a physics A level and so far loving it. I understand this question has indeed been asked before, however for different reasons. I understand the purpose of e=mc2 and I understand the formula. My question is related more the context in which this equation applies? Also, I understand that it is squared to reflect our dimension, however don't we operate in the 3rd dimension, in which case should it not be cubed? Perhaps I have misinterpreted what is being described?

Appreciate any help.