I know it's impossible to move faster than light, this is merely hypothetical.
When you move faster than light, you have infinite mass. Now, surely if that thing with infinite mass crashed into anything, wouldn't an infinite force would be produced (F=MA) ?
And wouldn't that force kinda fuck shit up?
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Yes, it would be pretty much impossible to stop. Luckily it would require infinite energy to accelerate the mass to that speed so there isn't much to worry about.