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E=mc2

Tub
in Astronomy and Cosmology

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Why is it not just E=mc? Why is the equation Squared?

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Just now, Klaynos said:

It is a simplification of

E^2=p^2c^2 +m^2c^4

Which is derived in special relativity. 

Also, E=mc must be wrong as it fails dimensional analysis. 

Thanks.

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