The equation $$v = \frac{u + v'}{1 + \frac{uv'}{c^2}}$$ describes how to combine velocities in the context of special relativity. This formula is crucial for understanding how speeds add together when they approach the speed of light, $c$. Unlike classical physics, where velocities simply add, this formula takes into account the effects of relativistic speeds and ensures that the resulting velocity never exceeds the speed of light.
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