you talk about physics and longer arms, well in the average person a taller person TYPICALLY has longer arms, therefor longer ark, therefor resulting in more club head speed with less effort.LOl im kinda spent on this topic.
Aha yes which then could lead us into discussing torque v. horsepower. Physics are inescapable. LOL. I suspect if we launch further into acceleration, peak velocity, velocity at impact ( which should be but not not necessarily is at peak velocity) we'd upset someone here for being off topic. ;-)