It doesn't move.
At the speed of light, time doesn't pass, so it never moves.
To answer the force question, light has no mass, only momentum, so it needs zero force to propel with infinite acceleration.
Or does it?
How's that for a headfuck?
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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