Answer=C
Supersonic speed is a rate of travel that exceeds the speed of sound. The speed of sound is Mach 1
a. Mach 0.5
b. Mach 1
c. Mach 1.5
C is the correct answer. Mach1.5>Mach1
a is less than the speed of sound, therefore it doesn't exceed it.
Mach0.5<Mach1
b is exactly the speed of sound, so it doesn't exceed it.
Mach1=Mach1
