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Average Velocity of a Sled

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A sled of mass m is being pulled horizontally by a constant horizontal force of magnitude F. The coefficient of kinetic friction is mu_k. During time interval t, the sled moves a distance s, starting from rest. Find the average velocity v_avg of the sled during that time interval. Express your answer in terms of the given quantities and, if necessary, appropriate constants. You may or may not use all of the given quantities.

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