16.如图所示一个质量为m的物体放在水平面上物体上方安装一个长度为l劲度系数为k的轻弹簧现用手拉着弹簧上端的p点缓慢�上移动直到物体 Template




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tomski16.如图所示一个质量为m的物体放在水平面上物体上方安装一个长度为l劲度系数为k的轻弹簧现用手拉着弹簧上端的p点缓慢�上移动直到物体 coloring