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OpenStudy (anonymous):
At one instant, a 17.0-kg sled is moving over a horizontal surface of snow at 3.70 m/s. After 7.80 s has elapsed, the sled stops. Use a momentum approach to find the magnitude of the average friction force acting on the sled while it was moving.
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OpenStudy (anonymous):
\[F=\frac{\Delta p}{\Delta t}\]
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