- #1
Cocoleia
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Homework Statement
A proton has a speed of 0.2c. Find the speed of an electron that has (a) the same kinetic energy as the proton, and (b) the same momentum as the proton.
Homework Equations
K=ϒmc^2-mc^2
The Attempt at a Solution
This is what I did for the same kinetic energy part, but I would end up with a negative under my square root. I found the formula in my notes, I'm not really sure what to do but I tried something. Can anyone offer me some guidance? I have not attempted the momentum part yet