Tell us what you think would cause (1) blackout, or (2) injury.

I don't see how you've gone from a static speed of 25020 mph to an

*acceleration* of 11,184.91 metres per second squared.

The G-force calculator at

https://rechneronline.de/g-acceleration/ tells us that going from 0 to 25020mph in one hour yields 0.71G. If the craft takes off from the ground, and reaches escape velocity in, say 20 minutes, even that only yields just over 2G on average.

The ISS goes around at 17k mph. If we assume a craft to have reached this orbital speed, and that it then wants to leave Earth orbit at 25k, and it does this in (say) five minutes, then it would be subject to just under 3G.