This has bothered me for a while. I've been taught that the formula for determining the perceived velocity on an object from another moving object's reference frame under special relativity is:
$$v = \frac{w - u}{1 - wu/c^2}.$$
If two objects travel from earth at $c$ in exactly opposite directions, what is the perceived velocity of one from the other? The formula seems to give a divide by zero error.
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