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Q. A car is travelling with constant velocity along a highway. The driver notices he is late for work, so he stomps down on gas pedal and the car begins to speed up. The car has just achieved double its initial velocity when the driver spots a police officer behind him and applies the brakes. The car then slows down, coming to rest at the stoplight ahead.

Q. Three point charges, -5.70 x 10-9 C, -9.30 x 10-9 C, and +7.30 x 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -1700 V. What is the radius of circle?

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