I have uploaded to YouTube (http://www.youtube.com/watch?v=xvw0_i1rGns) an analysis of the acceleration of a projectile that races ahead of the surrounding falling debris. I had discussed this object before but due to the difficulty caused by a moving camera I had not previously measured the motion directly.

The object (apparently a perimeter wall unit) raced ahead of its neighboring debris, but its acceleration was about 1/3 of gravity. This is an indication that it was kicked downward initially by an explosion, after which the air resistance partially canceled the effect of gravity as it approached terminal velocity. As it fell, however, there was an outburst of white smoke, at which point the projectile changed directions, slightly, and accelerated downward for about a half second at 1.5 times gravity. It then fell back to continued acceleration a little under 1 g.

The acceleration of the projectile is unambiguous proof that very energetic material was applied to the wall unit. What I found particularly surprising is that the ignition of the material in an unconfined space where it was free to expand three dimensionally would provide sufficient thrust due to expanding gasses alone to cause what was probably a 4-ton wall unit to accelerate 50% faster than gravity. The fact that the unit continued to accelerate close to freefall thereafter is an indication of an ongoing thrust capable of largely canceling the effect of air resistance.

A close-up view of debris being ejected from the South Tower of the World Trade Center as the 30-floor top section falls to the east shows numerous smoking projectiles that look like comets. Several of them can be seen to explode. One such exploding projectile is followed here. It ejects two fragments, both of which undergo secondary explosions. (Note, the rising fragment to the left of the projectile under consideration appears to be a tumbling object that alternates from black to white to invisible. It passes behind one of the fragments described in the video.)

--David Chandler

Near the end of the video I posted yesterday I pointed out a projectile that changed directions midair while trailing white smoke. After finding that projectile, I looked for it in other videos of the WTC2 collapse. I found a video from a similar point of view to the first (and Nate found me a high-res version of it), except in this video the trail can be followed all the way to the bottom of the collapse. This follow-up video explores the significance of this find.

This view of the destruction of the South Tower of the World Trade Center displays a remarkable number of features that support the interpretation that it was destroyed by explosives. I want to acknowledge the tremendous service provided by Nate Flach who serves as the defacto "video archivist" for AE911Truth. He is the one who first called this video to my attention, because of the huge number of simultaneous squibs on the west side of the building above the impact point.