Sure, that defines one side of the problem. The fall time in a gravity field with air resistance disregarded, which is okay.
so what's wrong with the fall time of the twin towers?
Is the fact that the resistance from the ENTIRE STRUCTURE of the building is disregarded? Apparently you think so. That is the ONLY way free fall speeds could be reached.
Oh I see. So there would be some modification of the formula to accomplish this. Then the correct formula describing the matter has not been posted?