![]() Totally false! You will hear none of what your friend said during the time the plane was at Mach 1, and merely hear some of the sonic booms that had not yet dissipated, because all their wavefronts will simply accumulate just in front of your friend once the pilot starts decelerating. Also, those wavefronts will dissipate if the plane remains exactly at the speed of sound. The vibrations cannot propagate faster (in terms of group velocity) than the speed of sound in air, which implies that you will not hear it. ![]() At Mach 1, everything your friend does (including moving his/her vocal chords) will result in little sonic booms around him/her. You cannot hear it, but not because of what you think. We did not even need to think about the specific details in your question. No it is not possible, obviously, because energy cannot come from nowhere. Isn't it wonderful? Hearing the same message again and again without any effort from your part! The real question emphasizes on the idea, of receiving a signal by overtaking it. In fact, that is only a part of the question. UPDATE: Most of the comments posted here are about the rewinding part. It is weird, but is such an observation plausible? If you keep on accelerating and decelerating the plane about the speed of sound, you can make your message to be heard multiple times by your friend!! Your friend hears the message in reverse!! Now, something remarkable happens when you do this. You speed up the plane, and your friend catches up with the message. Now, you yell out something at your friend. Your friend's sound catches up with you, and you hear the message! You ask the pilot to slow down the plane, and the plane gradually decelerates. Your friend yells out something at you, but you can't hear it, because it's Mach 1. You both take all the safety measures and stand on both the ends of the aeroplane with yourself near the nose and your friend near the tail, both facing in the direction of the aeroplane's motion. You have somehow got the permission to do the experiment which involves getting out of the plane. The flight is cruising at Mach 1 above Amazon rainforests, or some other place with comparatively low air currents. You board a supersonic jet along with your friend. ![]() It was then when he proposed an idea on an interesting experiment that can be done during a supersonic flight. I was having a discussion with a friend about supersonic flights.
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