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A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 63 kg, and the height of the water slide is 12.8 m. If the kinetic frictional force does -6.7 × 103 J of work, how fast is the student going at the bottom of the slide?

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