题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154098381770.jpg)
(2)在斜面和水平面上滑行的时间之比t1:t2。
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409853663.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154098381569.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409853663.gif)
(1)物块从A到C过程,由动能定理得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409869923.gif)
(4分)
将
(4分)
(2)∵物块在A、C处速率均为0,且物块在AB、BC上均做匀变速直线运动,
根据
上滑行的平均速度大小相等。(3分)
(4分)
注:本题用牛顿运动定律、动量定理求解同样参照给分。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409869923.gif)
(4分)
将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154098851006.gif)
(2)∵物块在A、C处速率均为0,且物块在AB、BC上均做匀变速直线运动,
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409900844.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115409853663.gif)
注:本题用牛顿运动定律、动量定理求解同样参照给分。
![](http://thumb2018.1010pic.com/images/loading.gif)
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