Proving the Impossibilty of the Pancake Collapse

With a few basic laws of physics we can show that the official account of a fire-induced, gravitational collapse of the Twin Towers on 9/11 is physically impossible.

The Towers came down in roughly 13 - 16 seconds. Freefall in a vacuum from the height their height is 9.2 seconds. (Galileo's Law of Falling Bodies) Calculations show that if the floors had magically hovered in the air with no supporting structure and provided no resistance to the floors above it would take a minumum of 15.5 seconds for 110 floors to reach the ground. (Law of Momentum Conservation)

So we have a free-fall collapse (had the floors been pancaking) indicating no resistance, yet we have the simultaneous ejection of heavy steel beams hundreds of feet and the pulverization and mushrooming of concrete and non-metallic material, indicating massive resistance. We have an impossible conflict.

An elementary energy analysis reveals a similar conflict. According to the official theory the only energy available to destroy the Towers (kinetic) was their potential gravitational energy. (Law of Energy Conservation) However the free-fall speed of the Towers means all of gravity's energy was used in bringing down the buildings leaving no energy left to pulverize the concrete, slice and eject the huge steel beams and produce to huge dust clouds that expanded to 5 times the volume of the buildings.

So what could account for the removal of resistance and the energy required to destroy the buildings? Explosives. One additional note - since the Towers were exploded from the top down, the rate of the collapse would be determined by the timing of the explosives.