Please explain A and B

(9%) Problem 7: An electron is initially at rest in a uniform electric field having a strength of 1.75 x 10 V/m. It is then released and accelerated by the presence of the electric field. *50% Part (a) What is the change in the electron's kinetic energy, in kiloelectron volts, if it travels over a distance of 0.325 m in this field?* 50% Part (b) Over how many kilometers would it have to be accelerated in the same electric field to increase its kinetic energy by 57.5 GeV