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frerelupin
#5
Sep18-11, 12:00 PM
P: 4
PAllen: Hmmmm... if I understand what you're saying (and I'm not certain I do!) you mean to say just do the velocity addition anyway? I'm trying to find a way around that part. As I said in my original post, I want to be able to show that v=d/t works in the rest frame, the 0.8c frame, and the 0.4c frame as long as we use the properly framed d and t values.

If you are saying I could do this, could you elaborate on which transforms you are talking about? Do you mean to say use:

\begin{equation}
x'=\frac{x-ut}{\sqrt{1-\frac{u^2}{c^2}}}
\end{equation}
and
\begin{equation}
t'=\frac{t-\left(\frac{u}{c^2}\right)x}{\sqrt{1-\frac{u^2}{c^2}}}
\end{equation}