যুদ্ধবিমান ও মিসাইলের গতিবেগ কিংবা ম্যাক শব্দ কি?

What is the difference between #hypersonic​, #supersonic​ and #subsonic​? As the speed of the object approaches the speed of sound, the flight Mach number is nearly equal to one, M = 1, and the flow is said to be transonic. At some places on the object, the local speed exceeds the speed of sound. In aviation: Supersonic - exceeds Mach 1. Hypersonic - exceeds Mach 5. Subsonic cruise missile flies at a speed lesser than that of sound. It travels at a speed of around 0.8 Mach. ... Hypersonic cruise missile travels at a speed of more than 5 Mach.