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Flight 175 crashed into the southern facade of Tower 2 of the World Trade Center (south tower) at 9:02:59, traveling at approximately 545 mph and impacting between floors 77 and 85 with approximately 10,000 gallons of jet fuel.
Originally posted by THE_PROFESSIONAL
Between frames 92 and 98 there is:
92 and 98 there is a pixel difference of 27.48 pixels = 103 feet
92 and 98 there is a time difference of 6 frames = 0.200 seconds
This gives a velocity of 103 feet/0.2 seconds = 514 feet/sec = 350 miles/hr
Originally posted by cams
Just for the record, the National Transportation Safety Board (NTSB) also conducted video analysis and provided varying groundspeeds aside from the 510 Knot rada data.
NTSB Video Data Impact Speed Study UA 175
Using distances taken directly from the video screen, flight 175's groundspeed was calculated to be between 473 and 477 Knots just prior to the collision with the building. Using distances taken from video screen prints, groundspeed at impact of 504 Knots and 507 Knots were calculated. This compares to an impact speed of 510 Knots calculated from radar data in the Radar Data Impact Speed Study (AA11 & UA 175)
[edit on 12-7-2010 by cams]
Originally posted by NineEleven11
Here is a GIF animation (slow):