Answer:
c
Mach number is a measure of the speed of an airplane. When we say an aircraft is flying at Mach 1, it means that the speed of the vehicle is 343 m/s. Mach number is the ratio between the true airspeed of the aircraft and the local speed of sound.
Speed is defined as the rate of change of position over time.
It indicating how quickly an object moves from one place to another.
It is a scalar quantity, meaning it only has magnitude and no direction.
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