如图所示质量为m的�属小球置于是14光�圆弧顶端的a处无初速度释放求1小球落至圆弧最低点b时的速度多大2此时圆弧b点受到的 Template




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tomski如图所示质量为m的�属小球置于是14光�圆弧顶端的a处无初速度释放求1小球落至圆弧最低点b时的速度多大2此时圆弧b点受到的 coloring