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WTC7 did NOT collapse in 6 to 7 seconds; you only get that figure by excluding the collapse of the east penthouse. The overall collapse took 18 to 19 seconds.
Free-fall requires that no forces act upon a body other than gravity. WTC7 was never in free-fall.
For over two seconds, WTC7’s outer shell and roofline accelerated downward at around g, the acceleration due to gravity, but this does not imply free-fall and is essentially a coincidence; the roof and shell of buildings subjected to known demolition typically accelerate at well under g precisely because the dismembered debris is NOT in free-fall; the dismembered parts are frantically colliding with each other, converting some of the available gravitational potential energy into the characteristic roar and pulverising much material.
WTC7 was never in free-fall even according to the UAF Report. The UAF simulation requires that for symmetrical collapse, all perimeter columns had to be severed 1.3 seconds after all the core columns; the forces between internal components of WTC7 were necessary for producing a symmetrical collapse in the simulation. Therefore, internal forces were acting in addition to gravity, therefore no free-fall.
My suspicion is that WTC7 was subject to emergency demolition, planned, rigged and executed on the afternoon of 9/11. Here is Dutch demolition designer the late Danny Jowenko discussing this possibility, and the possible reasons an emergency demolition might have been kept secret.