I'm writing something, and I need some assistance. Namely, I want it to be at least moderatly accurate to real life physics, so I would appreciate it if someone could give me an insight on how real-world physics would work in the following situations. First - what would happen if a human being of average strenght delivered a hundred punches in the span of 0.1 seconds or less(assume that the person is invulnerable). What kind of effects would it have on the surface that is being punched? Second - if someone ran at a speed very close to the speed of sound, and then surpassed the speed of sound by punching in the same direction in which he is running , what kind of effect would that cause? Would that even work? What kind of effect would that have on the surface the person is running on(asfalt/concrete). Assume the person in question is invulnerable, for the sake of argument. Third - if one threw bullets, so they have roughly the same speed as them being shot from a gun, would the bullets be able to fly in the same arc as if they were shot from a gun? How much strenght or speed in ones hand would that require? Standard 9mm caliber bullets are in question here. I'm grateful for any answers you might have.