An electron of mass 9.11 × 10^-31 kg moves with a speed of 0.800c. What is its kinetic energy? (c = 3.00 × 10^8 m/s)
a. 5.47 × 10^-14 J
c. 3.90 × 10^-14 J
b. 2.05 × 10^-14 J
d. 6.22 × 10^-14 J
A
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