1
1dem500
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
ac chua hju~ cho lem !!!! 1 con lắc lò xo co m=50g có pt x=AcosWt.cú sau khoang thoi gian0,05s thi Wd=Wt .K=?? A) 50(n/m) B)100(N/m) C)150(N/m) D) 200(N/m)
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