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An 8.0 kg object is moving in the positive direction of an x axis. When it passes through x = 0, a constant force directed along the axis begins to act on it. Figure gives its kinetic energy K versus position x as it moves from x = 0 to x = 5.0 m; K0 = 30.0J. The force continues to act. What is v when the object moves back through x = - 3.0m?

1839_positive direction of an x axis.jpg

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