# physics

Hi! could anyone help me to solve this problem please. Thank you.
Question:An electron has a speed of 0.68 c.
(a) Find the speed of a proton that has the same kinetic energy as the electron.
(b) Find the speed of a proton that has the same momentum as the electron.

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1. http://en.wikipedia.org/wiki/Kinetic_energy#Relativistic_kinetic_energy_of_rigid_bodies

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bobpursley

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