Speed is not what pushes you back. It’s acceleration, like you said. As long as there is acceleration (there is a change in speed occurring) then you will feel that as a force pushing you around. A plane at cruise speed is not changing speeds, and so there is no acceleration. You might be at 500 mph, 5000000 mph, or 0 mph. Doesn’t matter. You won’t be affected if there is no change happening (acceleration).
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