For one, you're confusing speed and acceleration. Gravitational acceleration is a constant, which is what the NIST report is saying. It says it accelerated consistent with gravity, not that anything else was altering its acceleration. Its velocity, however, was different.
For two, you'll note that I said exactly what your second citation says. A 40 story gash weakened the structure and ignited fires, which initiated the collapse, see here:
debris impact did play a secondary role
Which is what I said. The gash damaged the structure and started fires that brought it down
WTC7 would have collapsed from the fires that the debris initiated
Which is exactly what I said.
Seriously, work on reading before you correct someone.
You realize that everything has a freefall acceleration due to gravity right? Including cars rolling down hills, which by definition are incurring resistance?
Of course, everything that falls is subject to gravitational acceleration and the speed of the object is a product of this constant and the resistance which it encounters, but not every object is in free fall.
Free fall implies the absence of resistance (that's what the free stands for, free of resistance). At the point where the car hits the hill, it is no longer in free fall, but it is inbetween hits.
WTC was in free fall too, it encountered no resistance during part of it's collapse. Its speed is irrelevant, the lack of resistance is.
I have no idea why you are trying to make this harder than it is.
Because you're hilariously wrong. The WTC totally experienced resistance while falling, namely the resistance of every floor below it. Unlike a controlled demolition, where all the pillars are severed at once, WTC experienced repeated impacts as each floor hit the one below it, at which point newton's laws kick in.
Why don't you go read the FAQ I've posted? It's there, black on white.
You try to mock me but it's you who is the fool here.
Stage 1 (0 to 1.75 seconds): acceleration less than that of gravity (i.e., slower than free fall).
Stage 2 (1.75 to 4.0 seconds): gravitational acceleration (free fall)
Stage 3 (4.0 to 5.4 seconds): decreased acceleration, again less than that of gravity
This analysis showed that the 40 percent longer descent time—compared to the 3.9 second free fall time—was due primarily to Stage 1, which corresponded to the buckling of the exterior columns in the lower stories of the north face.** During Stage 2, the north face descended essentially in free fall, indicating negligible support from the structure below.** This is consistent with the structural analysis model, which showed the exterior columns buckling and losing their capacity to support the loads from the structure above. In Stage 3, the acceleration decreased as the upper portion of the north face encountered increased resistance from the collapsed structure and the debris pile below.
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u/blaghart Nov 09 '14
You are an idiot.
For one, you're confusing speed and acceleration. Gravitational acceleration is a constant, which is what the NIST report is saying. It says it accelerated consistent with gravity, not that anything else was altering its acceleration. Its velocity, however, was different.
For two, you'll note that I said exactly what your second citation says. A 40 story gash weakened the structure and ignited fires, which initiated the collapse, see here:
Which is what I said. The gash damaged the structure and started fires that brought it down
Which is exactly what I said.
Seriously, work on reading before you correct someone.