Actually, it always bugged me that she said "one quarter impulse power." In STTMP (and they used the exact special effects footage, for budget reason), Kirk said "thrusters ahead," and no mention of impulse -- which was appropriate. The impulse drive is the Enterprise's sublight propulsion, capable of taking the vessel up to high fractions of the speed of light; again, in STTMP, almost as soon as the ship is clear of the orbital drydock, Kirk tells Sulu to take the ship to "warp point five" -- i.e. half the speed of light.
So one quarter power from the impulse engines should have shot the Enterprise out of the orbital drydock like it had been fired from a cannon. That's why in the first movie, Kirk has the ship slowly move out of drydock using maneuvering thrusters only, for the very same sort of reason you don't floor the gas pedal when you're pulling out of your garage.
Honestly, this scene has always bothered me because it makes no sense, and directly contradicts a near-identical scene from the first movie. It epitomizes how bad Star Trek has sometimes been at maintaining consistency and continuity, and it comes out of a simple, lazy, totally avoidable writing mistake.
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