In classical physics E=Fd and F=ma so E=mad.(adsbygoogle = window.adsbygoogle || []).push({});

a=d/t^{2}so E=md^{2}/t^{2}

Measurements of d and t will get complicated by Lorentz transformation, so, is E=Fd still a correct definition of energy, or is it a Newtonian approximation which is not accurate at relativistic velocities?

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# What is the relativistic definition of energy?

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