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OpenStudy (anonymous):
A 4.0kg box slides a 20m distance on ice. If the coefficient of kinetic friction is 0.22, what is the work done by the friction force?
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OpenStudy (anonymous):
\[ W=F_f\cdot d\cdot\cos\theta\\ F_f=\mu N\quad,\quad d=20\quad,\quad\theta=180^\circ \]
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