Doesn't this post belong in "[OOOOOOOT]"? This isn't the list for conspiracy theories is it? > Yet an object dropped from a 7 story building will hit the ground in 6 > seconds. So are we saying that each of the 7 floors, hitting the floor next > to it, only slowed the fall by .6 seconds? That is patently impossible. You obviously don't know your physics. The energy acquired by each floor collapsing (32 ft/s/s => 1/2MV**2)) is mostly conserved and is transferred nearly instantly to the floor below, accelerating the lower floor much faster than if the floor had started collapsing on it's own. Hence the quicker than you expected collapse. Robert -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist