A 1400 kilogram car coasts on a horizontal road with a speed of 19 m/s. After crossing an unpaved, sandy stretch of road 35.0 meter long, its speed decreases to 16 m/s.
a) Determine was the net work done on the car positive, negative, or zero?
b) Explain.
c) Determine the magnitude of the average net force on the car in the sandy section.