I am currently reading Einstein's book "Relativity: The Special and General Theory", and I came across I point I don't quite understand.(adsbygoogle = window.adsbygoogle || []).push({});

Einstein says:

In accordance with the theory of relativity the kinetic energy of a material point of mass m is no longer given by

[tex]\frac{1}{2}[/tex]mv^{2}

but by the expression

[tex]\frac{mc^2}{\sqrt{1-\frac{v^2}{c^2}}}[/tex]

This doesn't make sense to me. According Wikipedia, its

[tex]\frac{mc^2}{\sqrt{1-\frac{v^2}{c^2}}}[/tex] - mc^{2}

My question is, who's right? Perhaps its a typo in the version of the book I have. But even if it is a typo, it seems future equations he explains build on the one he gives (above). Also, the calculations I did of Wikipedia's equations are much closer to the classical equation when v is slow.

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Relativistic Kinetic Energy

Loading...

Similar Threads - Relativistic Kinetic Energy | Date |
---|---|

I Relativistic Kinetic Energy Derivation | Mar 28, 2016 |

Insights Relativistic Work-kinetic Energy Theorem - Comments | Aug 23, 2015 |

Relativistic Kinetic Energy as a solution to a DE | Apr 27, 2015 |

Relativistic kinetic energy derivation (from Work expended) | Dec 11, 2014 |

Relativistic kinetic energy | Jun 15, 2013 |

**Physics Forums - The Fusion of Science and Community**