It is pretty easy for a physics student to grasp the equivalence between mass and energy.(adsbygoogle = window.adsbygoogle || []).push({});

But, Units of length, mass, and time were established before Einstein came along with

E=MCsquared

My question is: "Why is the proportionality constant between M and E simply Csquared?"

Is this just a coincidence, or, more likely, what am I failing to see.

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# Why is it only c squared?

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