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Every time a solution PDF shows you that you messed up a sign, a unit conversion, or a trig function, write that mistake down. Before your exam, review your mistake PDF—not the perfect solutions. This is the fastest way to raise your grade.

A 2 kg box is sliding on a frictionless surface at 5 m/s. It compresses a spring (k = 200 N/m). What is the maximum compression of the spring?

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