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Q. Two small plastic spheres are given positive electrical charges. When they are a distance of 14.6 cm apart, the repulsive force between them has a magnitude of 0.200 N.

What is the charge on each sphere if the two charges are equal?

Q. A 1800 {rm kg} car traveling at a speed of 33 {rm m/s} skids to a halt on wet concrete where f_k = 0.60. How long are the skid marks?

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