Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
A. 2.1 m/s
B. 1.5 m/s
C. 1.8 m/s
D. 2.4 m/s
E. 3.2 m/s
Answer: B
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