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# (Originais Teachy 2023) - Question Very Easy of Physics

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An airplane is flying horizontally at a constant speed, at an altitude of 1000 meters above the ground. Two passengers, Alice and Bruno, are sitting on opposite sides of the aircraft, separated by a distance of 10 meters, crossing the centerline of the plane. The aircraft and the passengers constitute a moving reference frame. (a) Define what a reference frame is and identify the reference frame at rest in this situation. (b) In relation to Alice's reference frame, what is Bruno's position? (c) If an observer on the ground is stationary 3000 meters in front of the plane, what will be the position of the plane in relation to the observer when it is directly above him?
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