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Cheezay

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## Homework Statement

An electron moves to the right in a laboratory accelerator with a speed of 0.822c. A second electron in a different accelerator moves to the left with a speed of 0.424c relative to the first electron. Calculate the speed of the second electron (in c) relative to the lab. Do not enter unit.

## Homework Equations

[tex]

V_{a/c} = \frac{V_{a/b} + V_{b/c}}{1 + (V_{a/b} V_{b/c})/c^2}

[/tex]

## The Attempt at a Solution

Relativity is difficult for me to get a handle on. The way I am setting this up, is I'm using the velocity .822c for Va/b and -.424c(since it this one goes left) for Vb/c, and Vac would be the velocity of the second electron relative to the lab, however I'm not getting the right answer. I'm guessing that I don't have the velocities substituted in the proper places in the formula, any help?