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mach 2
Mach number (Ma) (generally pronounce /ˈmɑːk/, sometimes /ˈmɑːx/ or /ˈmæk/) is the speed of an object moving through air, or any fluid substance, divided by the speed of sound as it is in that substance:
Trivia about mach 2
The MIG-21 was the first Soviet plane to reach this speed equal to 1480 MPH