More potential energy would be stored in the magnetic field, and the spacecraft magnet would travel farther/faster.
When an object is moved against a stronger magnetic force, it transfers more energy to the magnetic field because magnetic forces are stronger when magnets are closer.
The more energy gained in the magnetic field causes the spacecraft to travel faster and farther.
Thus, more potential energy would be stored in the magnetic field, and the spacecraft magnet would travel farther/faster.
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