题目内容
一个小球从倾角为θ的斜面上A点以水平速度v0抛出,不计空气阻力,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235197509.png)
(1) 自抛出至落到斜面需要的时间;
(2) 落到斜面上的B点到抛出点A的距离;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235197509.png)
(1) 自抛出至落到斜面需要的时间;
(2) 落到斜面上的B点到抛出点A的距离;
(1)
① 1分
② 1分
③ 2分
由①②③式,联立求得:
自抛出至落到斜面需要时间
2分 ④
(2)落点B到抛出点A的距离
3分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235244480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235275652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235322646.png)
由①②③式,联立求得:
自抛出至落到斜面需要时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235369802.png)
(2)落点B到抛出点A的距离
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241332354471156.png)
(1)
① 1分
② 1分
③ 2分
由①②③式,联立求得:
自抛出至落到斜面需要时间
2分 ④
(2)落点B到抛出点A的距离
3分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235244480.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235275652.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235322646.png)
由①②③式,联立求得:
自抛出至落到斜面需要时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133235369802.png)
(2)落点B到抛出点A的距离
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241332354471156.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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