All structures do not collapse top down at free fall speed.
You're obviously neglecting the effects of denpressure sceptimatic, which would vastly accelerate the downwards motion of the upper floors of the building. Such huge vertical structures as were the WTC towers would experience massive forces due to denpressure acting over their entire surfaces.
I can only guess, but I'm thinking that Björkman is also forgetting to add denpressure into his computations, as he seems not to have factored in your earlier equation supporting its effects. Could this fact throw serious doubt on the results of his final calculations?
Harp on all you want. You are deliberately denying your own physics to stick to the mainstream model of anything.
I know that you know fine well that those buildings could not collapse like they did from the top down.
If the top 10 floors were the real structure stood on top of 100 floors of polystyrene, I'd be backing you up. Is that the case?...no it's not.
It's not happening unless it was prepped and demolished in a controlled manner.
But the towers did not collapse at free fall speed.
By what we were shown on the TV, those towers fell at free fall speed. Now what we saw on the TV was fake but that's not the issue here. The issue is, they showed the towers falling at free fall speed.
How long would it take an iron ball dropped off one of those towers, to hit the ground?
How long did it take the buildings to fall to the ground?
What's the best and fastest way for a 110 storey ( steel framed) building to be rought to the ground?
Prep it with cutter charges after weakening the major structures. Put the cutter charges at an angle so the building walks one way then the other, like a zig zag at the same time as blowing all the other main structures in a timed (controlled) explosion from the bottom up allowing all floors to fall against little to no resistance.
This way you get close to free fall speed.
If that building collapsed from the top down after supposedly being hit by planes, the top part would have crushed a few floors before the top simply toppled over to the ground, leaving three quarters of that building still standing.