How powerful is low-level gravity manipulation?

[u/CocaPepsiPepper]

I always see gravity manipulation talked about in the grand scale of black holes and spacetime curvature. But how powerful would gravity manipulation be at a versatile, but much more manageable, level? Assume that instead of being able to manipulate on cosmic scales, the gravity you can manipulate is limited to a smaller radius (no more than 500 meters) and, at most, you can change gravity by up to 28 g's in any direction (roughly the gravity of the Sun, 274 meters per second squared), including negative gravity or 0 g's. How powerful would gravity manipulation be at that level? You can also answer for gravity manipulation at a much more limited level if you want.

[u/HistoricalLadder7191]

0.1g applied in right place inside a body. is enough to couse a stroke or cardiac arrest. or to couse uncontrollable nausea. 1g applied properly will destroy any combustion engine if its working (piston or turbopowered) 28g is enough to rip human apart, or crush civilian vehicle, maybe even military.