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 12th September 2006, 01:52 PM #164 Arkan_Wolfshade Philosopher   Join Date: Jan 2006 Posts: 7,154 Originally Posted by TruthSeeker1234 I agree. The 9 second figure is NIST, not me. Quote: At 9:58:59, the South Tower collapsed in ten seconds, source No estimated stated for North Tower. http://www.google.com/url?sa=t&ct=re...4F0RvDFt5J23xw : No estimates provided for collapse time. http://www.popularmechanics.com/scie...tml?page=5&c=y 8-10 second estimate, based upon seismic data http://www.jnani.org/mrking/writings...#_Toc144445996 rebuttal to Jones' collapse time argument http://www.911myths.com/html/wtc_col...estimates.html collapse time estimates 8-14 seconds Height of towers Height (ft) 1,368 source Let's check this, for freefall, in a vacuum we use X=at^2/2 or X= .5*a*t^2 where X=distance, a=9.8 m/s^2 and t=time. http://www.lerc.nasa.gov/WWW/K-12/airplane/mofall.html X=.5*a*t^2 X=.5*9.8*t^2 X=4.9*t^2 0 seconds => X=0 1 seconds => X=4.9m 2 seconds => X=19.6m 3 seconds => X=44.1m 4 seconds => X=78.4m 5 seconds => X=122.5m 6 seconds => X=176.4m 7 seconds => X=240.1m 8 seconds => X=313.6m 9 seconds => X=396.9m = 1028.87139 feet 9.25 seconds => X=419.25625m = 1375.51263 feet 9.5 seconds => X=442.225m = 1450.86942 feet 10 seconds => X=490.0m = 1607.61155 feet Now, please cite exactly where NIST said it fell in exactly 9 seconds.