The citizen's car is a 1700-kg Mercedes-Benz 300SL. The citizen manages to park his car next to the express on a highway that rises 15* above the horizontal. The coefficient of kinetic friction between the tires of the car and the road is 0.14. (a) Calculate the magnitudes of the normal forces and the static friction force exerted by the soil on the tires. (b) If at the moment the brakes that hold the car at rest give way and the car begins to move downhill, determine the acceleration and average force with which the car reaches the end of the hill.

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”