How fast is mark one?
Mach 1 is the speed of sound, which is approximately 760 miles per hour at sea level.
Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed medium through which the body is traveling. It is said that the aircraft is flying at Mach 1 if its speed is equal to the speed of sound in air which is 767.269 miles per hour.
Join Alexa Answers
Help make Alexa smarter and share your knowledge with the worldLEARN MORE