Creative Speculation
In reply to the discussion: North Tower Acceleration [View all]jesters
(108 posts)One need only view the videos of the tower's descent to understand the absence of the necessary deceleration. Mapping it out on a graph is basically just spelling it out in crayon for those who can't see that an under-15-second plummet to the ground with massive expulsion of matter all the way down is not possible gravitationally for a steel-framed, highrise superstructure.
The other point being entirely missed here is that in order for the upper portion of building to exert the kind of force that can destroy as well as completely pulverize the much taller, heavier and intact lower structure it would need to decelerate (to use the lay term). Visibly. You can't have that kind of force exerted without visible decelerations. This would be multiple punctuations in the building's descent, most likely resulting in collapse arrest before the ground is reached.
This isn't difficult, folks.