A proton is initially at rest at a point where the potential is 515 V. Some time later the proton is at a point where the potential is 190 V.

A proton is initially at rest at a point where the potential is 515 V. Some time later the proton is at a point where the potential is 190 V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy?.