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Q. Two positive point charges are 7.0 cm apart. If the electric potential energy is 80 microjoules, what is the magnitude of the force between the two charges?

Q. A 4.50 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 42.0 N. gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of vertical axis is set by vs = 5.10 m/s. What is the coefficient of kinetic friction between the block and the floor?

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