A particle (charge = 5.0 ?C) is released from rest at a point x = 10 cm. If a 5.0-?C charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 90 cm?
A. 1.6 J
B. 2.0 J
C. 2.4 J
D. 1.2 J
E. 1.8 J
Answer: B
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