A car skids to a stop on an icy road. The car has an initial velocity of 25.0 m/s and skids for 10.4 s before stopping. The mass of the car is unknown. a. Calculate the acceleration of the car. b. Draw the free-body diagram with the forces, but without their magnitudes. c. Find the coefficient of kinetic friction, ?k , between tires and the road

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Q: net force on the car

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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?”