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Originally Posted by fightnight
The fly obviously isn't flying 80 mph plus whatever speed/direction he's going.
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Says who? From the point of view of a stationary observer, that fly is speeding by. From your perspective, it's not going that fast because you're both going 80mph in the same direction, plus the the added velocity of the fly since you are sitting still.
It's not really about a separate environment. It's more to do with inertia. The car is going at a constant velocity. If you change velocity enough, the passengers in the car will keep going in the direction the were before unless they somehow stop themselves. Consider if a car suddenly hits the breaks and the passengers go flying towards the windshield.