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An aircraft flying at 40,000 feet can be heard to break the sound barrier when it achieves a speed of how many......

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An aircraft flying at 40,000 feet can be heard to break the sound barrier when it achieves a speed of how many miles per hour?

posted Sep 23 by Parampreet Kaur

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1 Answer

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600
The speed of sound at sea level is 760 m.p.h, and it decreases with altitude.

answer Sep 24 by Madhavi Latha
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