Drat!

I hate being an idiot. Intuitively I feel that there should be an energy calculation means of getting at WTC fall times, but, I can't put my finger on it.

I've had to scrap both my spring model and my most recent energy calculation idea.

However, I still feel good about my earlier post titled 9/11 collapse issues which gives a balance of forces argument about fall times.

Sorry to bother anyone.