Mach 1, Mach 2, Mach 3, etc. is used to describe a speed of a moving vehicle or object. “Mach” is basically the speed of sound. So when we say a vehicle is moving at Mach 1 speed — what we’re saying is that this vehicle is moving at the speed of sound (1234,8 km/h).
Do you know what Mach 1, Mach 2, Mach 3 mean?
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