When the car hits the cement road divider it is stopped (an outside force stops it from moving). The crash dummy, however, is not so lucky. Since he is not wearing a seat belt, and is not connected to the car, he will continue to move at 60 mph. This means he will go flying out through the front windshield (don't try this at home).
The dummy will fly through the air until he hits the ground. This is because the earth's gravity stopped him from moving any further (his trajectory is a combination of the downward force of gravity, and the horizontal force of the moving car). If this collision had happened in zero-g, in a vacuum, the dummy theoretically would keep on hurtling away from the car at 60 mph.
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