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As my simple understanding of it (the common explanation, not my opinion) is ifyou have two vehicles that accelerate from 0-100 Km/Hr in 16 seconds, when one ofthem is a car 1,500 Kg w/ a 60 HP engine and the other is a truck 5,000 Kg with a250 HP (put aside all the other factors). This very rough example explained why theysuppose to have the same acceleration.
In your explanations I did not see anything regarding the force require to accelerate each mass (feather / hammer), or maybe I missed it ?
Can you try to explain in 3 - 4 sentences what is defected in your opinion in the current explanation of the the hammer / feather test ?
What about Barau's cradle? What kind of wave does it employ to model energy transmission through the guiding line? Is it longitudinal "mechanical" wave of compression-rarefaction type, is it transverse "electromagnetic" wave of Maxwell, is it surface wave of Rayleigh, or is it ocean rolling wave? None of the above! This is a new type of wave, which I propose to call rock-n-roll wave; this term seems to reflect well the gist of the new concept for it has the right connotations.
But one can easily imagine a different, and a very simple arrangement of vortices that will work not only in 2D but also in 3D. See enclosed image.