The falling object, after traveling a certain distance through the air reaches a final speed, or "terminal velocity," 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。
Methods: The freely falling object was used to simulate the animal models of closed cerebral trauma.
方法：采用自由落体法制备闭合性脑外伤小鼠模型；
A graph of average speeds versus time can give the acceleration due to gravity of the falling object.
平均速度——时间图表可以给出这个自由落体的重力加速度。
Falling-object protective structure (FOPS) can block objects (such as trees, rocks) so that it supplies protection for the operator.
落物保护结构是在有坠落物体(如树木、岩石等)时，对司机提供适当保护的安全结构。
Falling-object protective structure (FOPS) can block objects (such as trees, rocks) so that it supplies protection for the operator.
落物保护结构是在有坠落物体(如树木、岩石等)时，对司机提供适当保护的安全结构。
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