An electron starting from rest acquires 4.8 keV of KE in moving from point A to point

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An electron starting from rest acquires 4.8 keV of KE in moving from point A to point B.
(a) How much KE would a proton acquire, starting from rest at B and moving to point A?
(b) Determine the ratio of their speeds at the end of their respective trajectories.
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