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Q. Three equal point charges, each with charge 1.05 mu C, are placed at the vertices of an equilateral triangle whose sides are of length 0.700 m. What is the electric potential energy U of the system?

Q. What should be the spring constant of a spring designed to bring a 1500 car to rest from a speed of 80 so that the occupants undergo a maximum acceleration of 5.0?

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