where Force (average) equals MASS times acceleration due to gravity relative to height of fall (which equals speed) divided by time of deceleration or deformation.
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Again, F=mA = rate of change of Momentum (M) where M= mV
Nothing to do with gravity or "relative to height of fall", which BTW has nothing to do with speed (i.e., velocity).
To be honest, I am not reading your links. Couldn't care less what they say on this topic.
I always enjoy your posts. Kinda' sorry I stepped in to correct your original post on the subject, because the angst is not worth it. But physics terms are very precise. This has nothing to do with my education. Just the facts.