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TWest

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Something has been bothering me for quite some time and when you cannot figure it out yourself ask a higher power, which happens to be this forum.

Basically, at low energies we use the Newtonian definition of kinetic energy which is E

Basically, at low energies we use the Newtonian definition of kinetic energy which is E

_{k}= 1/2MV^{2}Now at high energies/high volecities it turns into the relativity version of it which is E_{k}= MC^{2}G-MC^{2}. Now my question is at what point does this change from Newton's to Einstein's? Secondly, can you point me in the direction of a model that is accurate at low velocity and high?
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