If $E=mc^2$, and $E_k=\frac12mv^2$, what is the difference between $E$ and $E_k$?
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One is relativistic total energy (if $m=\gamma m_0$), and the latter represents the (classical) kinetic energy. – joseph h May 13 '23 at 06:20
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This is answered here https://physics.stackexchange.com/q/112343/ – Kris Walker May 13 '23 at 06:57
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Does this answer your question? $E=mc^2$ resembles non-relativistic kinetic energy formula $E_K = \frac{1}{2}mv^2$? – John Rennie May 13 '23 at 07:21