题目内容
质量为m的物体,由静止开始下落,由于阻力作用,下落的加速度为
g,在物体下落h的过程中,下列说法中正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007688382.png)
A.物体的动能增加了![]() | B.物体的机械能减少了![]() |
C.物体克服阻力所做的功为![]() | D.物体的重力势能减少了![]() |
A
试题分析:根据牛顿第二定律,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007766808.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007782646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007798915.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007813897.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007844752.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007860636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000007891498.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.物体的动能增加了![]() | B.物体的机械能减少了![]() |
C.物体克服阻力所做的功为![]() | D.物体的重力势能减少了![]() |