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You are traveling in a car going at a constant speed of 100 km/hr down a long, straight highway. You pass another car going in the same direction which is traveling at a constant speed of 80 km/hr. As measured from your car's reference frame this other car is traveling at -20 km/hr. What is the acceleration of your car as measured from the other car's reference frame? What is the acceleration of the other car as measured from your car's reference frame? Give an explanation to your answers.

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