Jet planes can exceed the speed of sound. The Mach number describes the speed of such planes. Mach 2 is twice the speed of sound. The speed of sound in air is approximately 344- Complete parts a. through c. below. m sec a. If the speed of a plane is described as Mach 2.2 what is its speed in kilometers per hour km hr (Round to the nearest whole number as needed.) km hr ?

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