I think if one can achieve super-luminal speeds, a force field would be an easy fix.
I dont think a force field, if possible, can stop rocks. How can you continually generate even a partial shield of energy in a cohesive pattern at FTL speeds without said energy affecting the ship. And it would need to be something of substance to be able to destroy rock or metal.
The force behind a baseball travelling 40k miles an hour or more is a lot of force.
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