Manny Pacquiao's automobile is about to come closer to a barrier at a speed of 25 m/s along a level road. He locks the brakes at a distance of 40 m from the barrier. What minimum coefficient of kinetic friction is required to stop the automobile before it hits the barrier?   0.2   0.4   0.8   0.5

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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?”