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Please answer all parts A 1300 kg car coasts on a horizontal road with a speed of 18 m/s. After crossing an unpaved, sandy stretch of road 38.5 m long its speed decreases to 14 m/s. (a) Was the net work done on the car positive, negative, or zero? positive zero negative Explain. This answer has not been graded yet. (b) Find the magnitude of the average net force on the car in the sandy section.