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Q. A point charge 4.20 mu C is held fixed at the origin. A second point charge 1.60 mu C with mass of 2.80×10-4 kg is placed on the x axis, 0.280 {rm m} from the origin. The second point charge is released from rest. What is its speed when its distance from the origin is 0.400 {rm m}.

Q. An athlete starts at point A and runs at a constant speed of 5.40 m/s around a round track 200 m in diameter, what is the x component of this runner's average velocity between points A and B?

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