I see how the premises(adsbygoogle = window.adsbygoogle || []).push({});

[tex]

p = \gamma m v

[/tex]

[tex]

F = \frac {dp}{dt}

[/tex]

and

[tex]

W= \int F dx

[/tex]

lead to

[tex]

dW = mc^2 d \gamma

[/tex]

and therefore

[tex]

W = \gamma mc^2 + k

[/tex]

where m is the rest mass and k is a constant of integration. But why do we conclude that k=0?

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# About the mass-energy relation

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