@Metalballrun @Therefir @TheRustyOne @Insert_creative_name_here_12 @Jackof_noTrades068 After doing a few hours of research, I've come to a conclusion. Apparently, you can judge the speed of an object if you compare the distance it's traveled in comparison to how wide the shockwave diameter is. For example, if X is moving at baseline supersonic speeds, the distance it travels should be equal to or slightly ahead of the diameter of its shockwave. This logically makes sense because if the shockwave is moving at Mach 1, it'll obviously cover similar distances in comparison to X that's moving at baseline supersonic speeds.
Let's look at Midoriya's Delaware Smash for this one. Notice how the ball (which would be the variable X) is so far ahead of the shockwaves it creates, it's nearly invisible. Even in the anime, it travels tens of meters before the shockwaves even reach half a meter.
This would suggest he threw the ball at speeds surpassing Mach 1 several or even ten times over. Aka, Mach 10-20. He did this with
just the
tip of his finger. Now, I'm definitely not a rocket scientist, but it's likely a full handed throw would likely reach even speeds exceeding 15,000 meters per second, or close to Mach 50. Remember, this is the very tippy-top of his finger, it's not even him using his entire limb.
Now, I probably could be wrong about this, but what's clear is the fact that he at least threw the ball at Mach 5 for it to travel that distance before the shockwaves even reach a meter and a half. This is some extremely deadass hypersonic material here which I doubt would even be lower than Mach 3.
And looking at his other smashes, presumably the ones at even
5%, you notice how he's capable of bending air pressure in such a way that it takes a spherical position around his arm.
Usually, if you punch the air the pressure you generate would travel in front of you, not backward. But, this can be ignored if an object is traveling at Mach speeds or speeds close to Mach 1, which is likely the case that is happening in this panel. To summarize, even Midoriya's 5% Smashes are capable of reaching speeds of Mach 1 and above