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A 2.1 x 10^3 kg car starts from rest at the top of a driveway tat is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4.0 x 10^3 N impedes the cars motion so that the cars speed at the bottom of the driveway is 3.8m/s. What is the length of the driveway?

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