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I got one for you from Wilson's COLLEGE PHYSICS 3rd Ed, Q15.64. The
problem states that an electron is moved tthrough a potention of 10^8 V
in a lightning discharge. Ignoring collisions, what KE does it gain?
The supposed e- gains 10^8 eV of KE.
Now, my reasoning is that an e- masses about 5x10^5 eV. Guess how fast an
electron with a KE of 10^8 eV is going.