题目内容
如图所示,一木块放在光滑水平面上,一子弹水平射入木块中,射入的深度为d,平均阻力为f。设木块运动s远时开始匀速前进,下列判断正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242249366804458.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242249366804458.png)
A.fd量度子弹、木块系统总动能的损失 |
B.fs量度子弹损失的动能 |
C.fd量度子弹损失的动能 |
D.f(s+d)量度木块增加的动能 |
A
试题分析:由动能定理,对子弹
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242249376941080.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824224939114782.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242249405801264.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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