F
FallingPianos
tenseconds said:The energy to create those high velocity clouds of dust far exceeds the potential energy in a gravitational collapse
you are totally ignoring the fact that the fall times are estimations some of which i've seen as high as 15 seconds. I'm agreeing with you that 9 seconds is physically impossible. There is also some confusion about the hight of the towers. the 471 number I used before was wrong, to the roof of the buildings the hight was actually 417 metres making the free fall time 9.22 seconds.
you are also totally ignoring the fact that buildings are designed to support the force of their standing weight, not their falling weight which is exponentially greater.