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I think there are two equations to look at for the "impact" of a punch:
Force = mass * acceleration (equal parts size and speed)
Kinetic Engergy = 1/2 mass * velocity squared (speed is more critical than size)
Which one is more appropriate for the impact a punch does, I'm not sure of. I think the Kinetic Energy (speed-related) creates the "smack" that registers with a guy like Tyson more than Tua and the force is definitely what moves the other guy off of his center of balance and stops his momentum. I don't know which is more applicable to causing a concussion or a broken rib, though. I'm interested in hearing from someone more knowledgable on that.
BTW, the standup technique forum might give better answers.
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