Peter Duniho writes:

I'm just pointing out that 9Gs is pretty survivable no matter
which direction you're going.

Just being bumped from behind at a traffic light can easily produce 9
Gs. This level of acceleration is too low to produce direction
injury, but if it is sustained (as in aerobatic flight) it can produce
cardiovascular problems, most of which are temporary.

And for the record, as long as the deceleration is given at 9Gs, it doesn't
matter whether you hit something hard or something soft. The impact is the
same.

For high accelerations, the product of acceleration and time at that
acceleration is important (or the integral of acceleration over time).
At 9 Gs, though, no direct physical injury is likely to occur no
matter how long it lasts.

I've seen an amusement park ride that "ejects" people upwards at 6 Gs
for about 500 ms. It doesn't produce any harmful effects.

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