Answered By: Emilie Smart
Last Updated: Sep 30, 2015     Views: 63

Google calculator shows speed of sound & mach 1 = 340.29 meter/second, or about 763.632 mi/hr.   But this is not a constant -- the speed depends on the temperature & the medium through which the object traveling.

NASA has a great introduction to mach numbers online; you can also look at the NewByte Flight Dynamics website.

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