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Depends on the person, most would black out when going at 3 or 4 G.
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Answer #2:
"3G" and "4G" are not speeds, and speed doesn't cause anyone to black out.
Speed imposes no stress on the body at all.
Stress is imposed by CHANGE in speed. Speeding up, slowing down, or rounding a curve too drastically. Those changes are called "acceleration", and can be measured in 'G's.
The correct question is: How many Gs of acceleration will cause you to black out ?
What else can I help you with?
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