题目内容
张飞同学参加学校运动会立定跳远项目比赛,起跳直至着地过程如图,测量得到比赛成绩是2.5m,目测空中脚离地最大高度约0.8m,忽略空气阻力,则起跳过程该同学所做功最接近
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048496834825.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048496834825.png)
A.65J | B.750J | C.1025J | D.1650J |
B
试题分析: 运动员做抛体运动,从起跳到达到最大高度的过程中,竖直方向做加速度为g的匀减速直线运动,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004849698856.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048497301291.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004849761981.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004849776995.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.65J | B.750J | C.1025J | D.1650J |