Tour Broca was a 15 story structure in which 2 stories being pushed out resulted in a period of free fall for about about 13% of its hight.
Based on measurements, or are you simply guessing?
WTC7 was a 47 story structure which expeanced a free fall equvanlt to 8 stories, which comes out to about 17% of its hight.
Which part of that are you attempting to deny?
Which 13%, and
which 17%? I assume you're claiming that the Tour Broca fell at freefall for the first 13% of its height, then at a lower acceleration for the remaining 87%. Why you're claiming that, I'm not certain; have you measured the rate of collapse and determined the variation of acceleration with time, or are you just making assumptions? If the latter, then your reasoning is based on an absence of premise. In any case, that's a different collapse dynamic to WTC7, in which the acceleration was initially below 1G, increased to close to 1G, then decreased. Shouldn't it be obvious that such a radical difference in the collapse dynamics points to a different collapse mechanism? It is to me.
Can you exemplify the clear differences you allege?
The building rotated to the south as a relatively solid block as it fell, as is clearly visible in the video. Deliberate building implosions are designed to make the building fall vertically into its own footprint. In other words, a central claim about WTC7 is quite simply untrue; it
did not fall neatly into its own footprint like a CD. The rotation of the structure, in fact, indicates the same thing that the rotation of the upper blocks of both WTC1 and WTC2 - that the support columns did not fail simultaneously, but rather than an initial failure at a point of maximum stress propagated through the structure and imparted angular momentum to it in doing so. The argument of the truth movement has always been that the lack of any rotation in WTC7 is evidence of a carefully timed event. Since the rotation is observed, this argument is refuted.
I know the structure of the building had provided over 100% of the resistive force necessary to hold up the roof before it started to fall, and falling with free fall acceleration can only be acomplished when the restive force is approximately 0% of that.
Please calculate the resistive force of an eight-storey section of building which has suffered a buckling failure and is now disconnected at both upper and lower ends as well as a third buckle point somewhere in the middle. You'll find that it's approximately 0% of the static strength, thus satisfying the above requirement.
Rather, there is an instant of transfer of momentum, but that doesn't explain the whole roofline coming down with free fall acceleration over a period of seconds, which is the issue I was discussing in the quote you responded to.
The transfer of momentum doesn't have to be instant. Inelastic collisions proceed by plastic deformation and fracture of the colliding bodies, which can be an extended process. As for "the whole roofline", there wasn't even a well-defined roofline; it had a pronounced and visible kink in the centre. The observation is that the average acceleration over a period is close to 1G within measurement errors, which are significant.
But I don't expect you to understand the concept of measurement errors. I have yet to encounter a truther who does.
Rather, there is no other way it could have happened, which has been my argument all along. Your "most likely" makes me curious to know what less likely possibilities you are imagining.
Since I've described them in posts that you've responded to, and you have indeed responded to them specifically in this post, I'm curious to know how you can claim not to know what they are. I can understand you failing to follow my arguments, but here you're failing to follow your own.
Dave