You're making no sense grahod. I just said, what free fall is in...

You're making no sense grahod. I just said, what free fall is in a vacuum (9.2 secs) and compared it to the 15 secs it took one of the buildings to collapse. That leaves only approx 6 seconds of gravitational energy for destroying the buildings if you were to break up the energy to time. 9.2 of that 15 seconds cannot be producing any destructive energy whatsover as it is a free fall time where the law of conservation of energy says that there is no energy left for anything other than maximum acceleration downwards. Of course this is just splitting it up for illustrative purposes. But the physics is sound.