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Why isn't the kinetic energy going into the upper block to crush it, arresting the process? ... Don't tell me it's because the block fell - when it hits a floor, the impact energy is also transferred upward.
By that logiv, we should expect <symmetric crushing of floors both upwards and downwards of the original structural failure, with the top uncrushed floors moving at a faster and the crushed floors at a slower speed downwards, both accelerating, and certainly no arresting of the process. What would then arrest the process would be a floor that could absorb all the energy and momentum of the floors upwards...
Since I can't access the link, I don't know what exactly the authors claim as sequence of floors crushing.
One whose delusions are out of fashion.
If that doesn't work, it's the first one here:
The top uncrushed floors would lose mass and not momentum as they were crushed. The videos show the upper block gone early in the process.
I'm finished here. If you want to keep believing this lie, that's your prerogative. Anyone watching that video without any preconceptions would see that explosives or some other device was used to pulverize the buildings.
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