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[–] belphegorsprime 1 point 5 points 6 points (+6|-1) ago
There is a misconception spread widely about this. For starters, there is no such thing as "freefall speed". There is a concept of "free-fall acceleration", however. Towers 1 & 2 did not show such acceleration (they accelerated at a rate lower than gravitational acceleration). But building 7 did in fact fall at free-fall acceleration for about 2 seconds. There was a really good analysis of building 7 done by David Chandler.
Some odd details about towers 1 & 2: although the buildings collapsed and descended at a rate slower than the acceleration due to gravity, the trajectory of various pieces of large debris suggests a source of energy other than that available from the mere gravitational potential of the mass in the structure. The horizontal component of the velocity vector of each item being projected laterally cannot be accounted for by gravity alone. If you examine the footage of the first two towers, you can see massive structural elements being ejected laterally at high velocities from some of the highest floors of the building. This alone should raise some eyebrows, without even mentioning the squibs, and all the other questionable details.
[–] Butterbread ago
Sounds true, but I really don't know the data enough, and I am sufficiently rusty on the Physics so as to be ignorant. I cannot make the judgement.
I understand things look odd, including sideways trajectories and squibbs, but in a massive fucking catastrophe things tend to get chaotic to say the least. That is, the sideways action and dust/smoke puffs could have legitimate non-explosive causes and so I am open-minded but not convinced it is proven.
[–] belphegorsprime 0 points 1 point 1 point (+1|-0) ago
It's worth looking into. Here's a good start on building 7: https://hooktube.com/watch?list=PL206C1F5EDFC83824&v=rVCDpL4Ax7I
and a good compilation by David Chandler, who is does a very objective analysis:
http://911speakout.org/david-chandler/