In an amusement park, a car with a mass of 481 kg rolls in a track as shown below. Note that the work done by the rolling friction is not zero between the starting point and point A. If the speed of the car in point A is 21 m/s, what is the magnitude of the work done by friction between the starting point and point A? Assuming that there is no friction between points A and B, and, If the speed of the car in point A is 21 m/s, what is the magnitude of the speed of the car in point B? Assuming that there is no friction between points B and C, and, If the speed of the car in point B is 5 m/s, what is the magnitude of the speed of the car in point C?

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