Question: At the moment a plane is directly overhead, why does the direction from which the sound comes depend on the speed of the aircraft? For

At the moment a plane is directly overhead, why does the direction from which the sound comes depend on the speed of the aircraft? For the example of the Boeing 737 at 10 km altitude, assume an average sound speed along the path from the plane to your ear and find the angle above the horizontal from which the sound comes at the moment the plane itself is overhead

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