- #1

- 787

- 20

[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?