题目内容
(12分)以20米/秒的初速度将一物体由足够高的某处水平抛出,当它的竖直速度跟水平速度相等时(g取10m/s2)
求(1)经历的时间;
(2)经历的水平距离;
(3)这时物体的速度方向与水平方向的夹角;
(4)这段时间内物体的位移大小。
求(1)经历的时间;
(2)经历的水平距离;
(3)这时物体的速度方向与水平方向的夹角;
(4)这段时间内物体的位移大小。
(1)t=2s
(2)x=40m
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204383290.gif)
(4)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204399368.gif)
(2)x=40m
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204383290.gif)
(4)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204399368.gif)
(1)
,t=2s
(2)
,x=40m
(3)
,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204383290.gif)
(4)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204399368.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204415375.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204430364.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204446520.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204383290.gif)
(4)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121204399368.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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