A 1500kg car begins sliding down a 5.0° inclined road with a speed of 30km/hr. The engine is turned off and the only forces acting on the car are a frictional force from the road and the gravitational force. After the car has traveled 50m along the road its speed is 40km/hr. a. (4) How much is the mechanical energy of the car reduced by the frictional force? b. (4) What is the magnitude of the frictional force? while the car travels the 50m distance?

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