题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500507214.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500522219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500538200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500538205.gif)
A.在铅球要离开手时,手和铅球的速度是相同的,加速度也是相同的,都等于g |
B.人对铅球做的功为![]() |
C.人对铅球做的功为![]() |
D.人对铅球做的功为![]() |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155006322804.gif)
C
从图(甲)到图(乙)的过程中,根据动能定理有:
,所以
;从抛出后到落地,根据动能定理得:
,代入上式可得:
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500647793.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500663774.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500678738.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115500694660.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.在铅球要离开手时,手和铅球的速度是相同的,加速度也是相同的,都等于g |
B.人对铅球做的功为![]() |
C.人对铅球做的功为![]() |
D.人对铅球做的功为![]() |