Why is mass squared by the speed of light squared, in $E = mc^2$?

Asked Mar 24 '25 at 13:43

Active Mar 24 '25 at 16:15

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In Einstein's equation of mass-energy equivalence, why does he multiply mass by the speed of light squared, if mass is energy and vice versa? Also, why the speed of light? Why not some other huge constant?

edited Mar 24 '25 at 16:14

Qmechanic

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asked Mar 24 '25 at 13:43

xac0

Why is mass squared by the speed of light squared, in $E = mc^2$?

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