A proton with an initial speed of 400000 m/s is brought to rest by an electric field

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A proton with an initial speed of 400000 m/s is brought to rest by an electric field.

Part A- Did the proton move into a region of higher potential or lower potential?

Part B - What was the potential difference that stopped the proton?
?U = ________V

Part C - What was the initial kinetic energy of the proton, in electron volts?
K_i =_________eV