If I have a fleet of a thousand cars it would take the energy of 300,000 gallons of gasoline to make the move fro Detroit to Chicago..
The were many tons of dust that had to make the trip from the WTCs to their resting place blocks away.
We can sum all the energy to hurl the steel beams plus all the energy to blow all the dust away.
Then ask the question of where all the that energy came from. If less energy was produced when the building collapsed than was needed to eject the mass of the building out into the street, then the energy checkbook does not balance. But the laws of physics cannot be broken. It would be a literal smoking gun.
Free includes debt-free!