The falling object, after traveling a certain distance through the air reaches a final speed, or "terminalvelocity," because the object's friction with the air slows the fall.
物体在下落一定距离后由于空气阻力都会达到一个终极速度。
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The falling object, after traveling a certain distance through the air reaches a final speed, or "terminalvelocity, " because the object's friction with the air slows the fall.