“What are you trying to prove?”
Sorry to “yell,” but I am so #$%* tired of the “truther” squad and their demonstrable insanity.
WTC 1 and 2 did not “free fall” Moreover neither building came close to “free fall.” Individuals claiming such are either willfully ignoring the facts or too lazy to research legitimate sources (Wikipedia does not qualify!), and so they resort to repeating the myths spread by uneducated people.
You would get angry too, if, having a background in engineering and architecture, you had to battle this lunacy every other day. It gets old.
I freely admit that your field of expertise is beyond me. Can you define "free fall"?