一条轻弹簧和一根细线拉住一个质量为m的小球平衡时细线ab�水平弹簧与竖直方�成θ角如图2所示若突然将细线剪断求剪断细线瞬间小球的 Template




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tomski一条轻弹簧和一根细线拉住一个质量为m的小球平衡时细线ab�水平弹簧与竖直方�成θ角如图2所示若突然将细线剪断求剪断细线瞬间小球的 coloring