In a railroad classification yard, a 69-Mg freight car moving at 1.2 m /s at A encounters a retarder section of track at B which exerts a retarding force of 48 kN on the car in the direction opposite to motion. Over what distance x should the retarder be activated in order to limit the speed of the car to 2.9 m /s at C? 143 m A 3.9 m B (Vertical scale exaggerated) C

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