The fly in the air is subject to the motion/momentum of the air in teh car since it's suspended in it and has such a light weight. (or atleast is my udnerstanding). The air in the car may move very little (if at all) when you hit the brakes, maybe some slight pressure changes.. but for the most part it wont move. Now if you have a window open or are in a convertable thats a different story since the air will have someplace to move and the fly will move where the air goes.
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We Must Dissent.
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