Dear Sirs,(adsbygoogle = window.adsbygoogle || []).push({});

I have discovered these two formulas:

p = (1-v^2/c^2) * dKE / dv

v = dKE / dp

where

p – momentum;

v – velocity;

KE – kinetic energy.

Everywhere are used relations with full energy instead of kinetic.

Therefore would be nice to know why these two are not used?

Are they correct?

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# Relations between kinetic energy, momentum and velocity

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