A 125mm gun has a muzzle velocity of 1800f/s and that is hyper-sonic.
“ A 125mm gun has a muzzle velocity of 1800f/s and that is hyper-sonic.”
I am pretty sure that is “only” supersonic, which means it is faster than sound. I have read that hypersonic means 5x the speed of sound. There have been reports that the new Russian missile goes up to 12x the speed of sound.
The term hypersonic missile is understood to be a missile that travels at hypersonic speeds and is also maneuverable at the same time, not a simple direct ballistic path like a ballistic missile. Maybe they should come up with a new term such as ‘evasive hypersonic.’