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Source: Wiki: G-force
Human g-force experience
* Fuji Q Highland, an amusement park in Fujiyoshida, Yamanashi, Japan, used to operate a shuttle coaster named Moonsault Scramble that subjected riders to 6.2 g in the track's high speed pretzel element. The Texas Tornado reached 6.7 g.
* Paraglider pilots can experience 6 g or more in spiral dives.
* Although the safety of the NASCAR stock cars is high, NASCAR Sprint Cup driver Jeff Gordon experienced the third highest ranked g-force crash recorded by NASCAR at the 2006 Pennsylvania 500 race at Pocono Raceway with an unprecedented 64 g crash. Gordon reported that at the time, it was the hardest hit he ever took in a car.
* Pilots in the Red Bull Air Race commonly exceed 10 g for seconds during turns, occasionally surpassing 12 g.
* Formula One drivers usually experience 5 g while braking, 2 g while accelerating, and 4 to 6 g while cornering. Every Formula One car has an ADR (Accident Data Recovery) device installed, which records speed and g-force. According to the FIA Robert Kubica of BMW Sauber experienced 75 g during his 2007 Montreal GP crash. 
Strongest g-forces survived by humans
Colonel John Stapp in 1954 sustained 46.2 g in a rocket sled, while conducting research on the effects of human deceleration.
Formula One racing car driver David Purley survived an estimated 179.8 g in 1977 when he decelerated from 173 km/h (108 mph) to 0 in a distance of 66 cm (26 inches) after his throttle got stuck wide open and he hit a wall.
Indy Car driver, Kenny Bräck crashed on lap 188 of the 2003 race at Texas Motor Speedway. Bräck and Tomas Scheckter touched wheels, sending Bräck into the air at 200+ mph, hitting a steel support beam for the catch fencing. According to Bräcks' site his car recorded 214 g.
Originally posted by Optix
I wonder what kind of tech is used to achieve that speed? magnets? Also where are all the sounds of sonic booms going?14,000 mph is way over the sound barrier.
Originally posted by 12.21.12
According to the movie Loose Change witnesses claimed to have seen transport taking place underneath WTCII. Many passengers were said to be hauled off to NASA headquarters in Ohio.