FIG.2: WTC7fell symmetrically and at free-fall acceleration for a period of 2.25 seconds of its collapse (Source: NIST).
image-title: screen-shot-2016-09-07-at-15-09-18
FIG.2: WTC7fell symmetrically and at free-fall acceleration for a period of 2.25 seconds of its collapse (Source: NIST).
