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catch-22
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Homework Statement
An electron moves to the right with a speed of 0.90c relative to the laboratory frame. A proton moves to the left with a speed of 0.70c relative to the electron. Find the speed of the proton relative to the laboratory frame.
Homework Equations
Vx'=[Vx-V]/[1+(v2/c2)*Vx]
The Attempt at a Solution
I have no idea where to start other than substituting 0.9c in for V.
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