题目内容
如图所示,有若干相同的小钢球,从斜面上的某一位置每隔0.1s释放一颗,在连续释放若干颗钢球后对斜面上正在滚动的若干小球摄下照片如图,测得AB=15cm,BC=20cm,试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241138184701396.gif)
(1)拍照时B球的速度;
(2)拍摄时sCD=?
(3)A球上面还有几颗正在滚动的钢球
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241138184701396.gif)
(1)拍照时B球的速度;
(2)拍摄时sCD=?
(3)A球上面还有几颗正在滚动的钢球
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818501949.gif)
(2)sCD=25cm
(3)A的上面还有2个小球
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818501949.gif)
(2)sCD=25cm
(3)A的上面还有2个小球
(1)A、B、C、D四个小球的运动时间相差△T=0.1s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818501949.gif)
(2)sCD=25cm
(3)由
得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818548584.gif)
则可得A的上面还有2个小球
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818501949.gif)
(2)sCD=25cm
(3)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818533407.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818548584.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113818564544.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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