如图所示劲度系数为k的轻质弹簧一端系在竖直放置的半径为r的圆环顶点p另一端系一质量为m的小球小球穿在圆环上作无�擦的运动.设开始时小球 Template




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tomski如图所示劲度系数为k的轻质弹簧一端系在竖直放置的半径为r的圆环顶点p另一端系一质量为m的小球小球穿在圆环上作无�擦的运动.设开始时小球 coloring