A 1400 kg car begins sliding down a 15.0 ° inclined road with a speed of 33.0 km/h.The engine is turned off, and the only forces acting on the car are a net frictional force from the road and the gravitational force. After the car has traveled 53.0 m along the road, its speed is 44.0 km/h. (a) How much is the mechanical energy of the car reduced because of the net frictional force? (b) What is the magnitude of that net frictional force?

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Chapter7: Work And Kinetic Energy
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A 1400 kg car begins sliding down a 15.0 ° inclined road with a speed of 33.0 km/h.The engine is turned off, and the only forces acting on the car are a net frictional force from the road and the gravitational force. After the car has traveled 53.0 m along the road, its speed is 44.0 km/h. (a) How much is the mechanical energy of the car reduced because of the net frictional force? (b) What is the magnitude of that net frictional force?      
 
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