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An electron is accelerated from rest through a potential difference that has a magnitude of 2.40 x 10⁷ V. The mass of the electron is 9.11 x 10^-31 kg, and the negative charge of the electron has a magnitude of 1.60 x 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.

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