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A proton moves with a speed of 0.66c. Find the speed of an electron that has...

A proton moves with a speed of 0.66c. Find the speed of an electron that has the same momentum and kinetic energy. (Express the answer as the quantity of one minus a number times c.)

same momentum (1- answer) x c

same kinetic energy (1-answer) x c

answer is where the answer would be plugged in, thank you!

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