I am not sure if you did graspe the free fall issue correctely!!! And this is just the first part of the crash course.
You know that a 20,000 tonnes of concrete and steel falling from the height of 415meter ( which is the height of the WTC1 or 2 ) in a vaccume will take 9.2 second to reach the ground. Work it for yourself, the foluma is t = sqrt(2 * distance/g), g is the gravity acceleration = 9.8m/s/s
Now, the same object ( 20,000 tonnes of concrete and steel ) falling through all the floors below, i.e., not through vaccume, but through concrete and steel, took 10 seconds to reach the ground in the case of the south tower.
You can watch it again on Youtube or Google and count it using your stop watch. WTC2 start collapsing....1..2..3..4..5..6..7..8..9..10 second. Now the upper floors of the tower reached the ground.
This is exactely what happened on 9/11
This is totally impossible, NO LAW OF PHYSICS CAN SUPPORT THIS, unless other forces were involved during the collapse. And this can only happen during CONTROL DEMOLITION.