物体自楼顶处自由落下（不计空气阻力），落到地面的速度为v．在此过程中，物体从楼顶落到楼高一半处所经历的时间为_刷题宝

题干

物体自楼顶处自由落下（不计空气阻力），落到地面的速度为v．在此过程中，物体从楼顶落到楼高一半处所经历的时间为（）

A： $\frac{(\sqrt{2} - 1) v}{g}$

B： $\frac{v}{2 g}$

C： $\frac{\sqrt{2} v}{2 g}$

D： $\frac{(2 - \sqrt{2} v)}{2 g}$

上一题下一题 0.0难度选择题更新时间:2013-12-29 02:35:01

答案(点此获取答案解析）

C

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