An electron is accelerated from rest through a potential difference that has a magnitude of 1.35×10^7 V. The mass of the electron is 9.11 10^-31 kg, and the negative charge of the electron has a magnitude of 1.60 10^-19 C.
(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. (Give your answer to four significant figures.) c