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**electrons -- Relativistic velocity addition...**

## Homework Statement

an observer measures the velocity of two electrons, finding one with a speed c/2 in the x direction and the other c/2 in the y direction. what is the relative speed of the two electrons.

## Homework Equations

## The Attempt at a Solution

Im not sure if this is right it seemed to easy.

but suppose that electron 1 is called b and the other a

then v(b)= √(c

^{2}/4+c

^{2}/4)

since they are at right angles to each other. is this right?