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OpenStudy (anonymous):
A student attaches a rope to a couch with a mass of 50 kg. She pulls with a force of 70 N at an angle of 45° with the horizontal force. The coefficient of kinetic friction between the couch and the sidewalk is 0.500. Find the frictional force.
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OpenStudy (zephyr141):
\[f_{k}=\mu*m*g\]
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