clearly the manga dont care about making sense of physics or something like that. even Merica here kicking to the left while bending her body to the far right, thats just not how body should move in CQC since that will take away the kick momentum (though this may be artist fault more).
best we shut our brain logic reading this
They have FTL drives
nothing matters when it comes to the laws of motion anymore besides they do still have inertial velocity since the people inside the ship do they thrown around when it turns suddenly but the ship's movement in space doesn't need to obey anything