题目内容
(8分)一辆长途客车正在以
的速度匀速行驶.突然,司机看见车的正前方
处有一只狗,如图(甲)所示,司机立即采取制动措施。若从司机看见狗开始计时(
),长途客车的速度-时间图象如图(乙)所示,g取l0m/s2。
(1)求长途客车从司机发现狗至停止运动的这段时间内前进的距离.
(2)若狗正以
的速度与长途客车同向奔跑,问狗能否摆脱被撞的噩运?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241224423738516.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442061414.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442186384.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442295228.gif)
(1)求长途客车从司机发现狗至停止运动的这段时间内前进的距离.
(2)若狗正以
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442311383.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241224423738516.jpg)
(1)50m
(2)狗将被客车撞上
(2)狗将被客车撞上
(1)在
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442389215.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442513672.gif)
(2)当客车在减速时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442529716.gif)
当客车由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442716461.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442857418.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122443059672.gif)
司机从看到狗到客车减速为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122442857418.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241224431221422.gif)
而在此时间内,狗前进的位移为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122443137853.gif)
因为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122443153290.gif)
所以,狗将被客车撞上。 (1分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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