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Q. A 18.6 g of Styrofoam carries a net charge of -0.686 uC and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet.

Q. A certain car is capable of accelerating at a rate of 0.63 m/s2. How long does it take for this car to go from a speed of 56 mi/h to a speed of 60 mi/h?

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