An electron is accelerated from rest through a potential difference that has a magnitude of 3.00x10^7 V. The mass of the electron is 9.11x10^-31, and the negative charge of the electron has a magnitude of 1.60x10^-19.
(a) What is the relativistic kinetic energy (in joules) of the electron?
(b) What is the speed of the electron? Express your answer as a multiple of c, the speed of light in a vacuum.