'Any object said to be traveling at hypersonic velocity has a speed over 5 on this scale named for an Austrian'
Mach
SPEED: Any object said to be traveling at hypersonic velocity has a speed over 5 on this scale named for an Austrian
Any object said to be traveling at hypersonic velocity has a speed over 5 on this scale named for an Austrian
Any object said to be traveling at hypersonic velocity has a speed over 5 on this scale named for an Austrian
SPEED
Mach
SPEED