An Electron of Mass 9

Multiple Choice

An electron of mass 9.11 × 10−³¹ kg moves with a speed of 0.800c.What is its total energy? (c = 3.00 × 10⁸ m/s)

A) 13.7 × 10−¹⁴ J
B) 10.2 × 10−¹⁴ J
C) 4.80 × 10−¹⁴ J
D) 7.30 × 10−¹⁴ J