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## Homework Statement

an electron starting from rest acquires 3.53keV of kinetic energy in moving from A to B. how much kinetic energy would a proton acquire moving from B to A.

## Homework Equations

1/2mv

^{2}

m

_{e}=9.11e-31 kg

m

_{p}=1.67e-29 kg

1eV=1.6e-19 J

## The Attempt at a Solution

conservation of energy, using potential energy = 0 at ending points and KE=3.53 at ending point so it should be equal to initial potential energy. But that's equal to q*E*s and i don't know E or s