题目内容
一杂技演员,用一只手抛球.他每隔0.40s抛出一球,接到球便立即把球抛出,已知除抛、接球的时刻外,空中总有四个球,将球的运动看作是竖直方向的运动,球到达的最大高度是( )(高度从抛球点算起,取
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241144204532593.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114420438483.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241144204532593.jpg)
A.1.6m | B.2.4m | C.3.2m | D.4.0m |
C
空中总有四个球,如右图所示球到达的最大高度所需的时间为
,球抛出时的初速度
,
由
,解得球到达的最大高度
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114420484536.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114420484750.gif)
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114420516448.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114420531816.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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