如图所示将一光�的半圆槽置于光�水平面上槽的左侧有一固定在水平面上的物块.今让一小球自左侧槽口a的正上方从静止开始落下与圆弧槽相切自a点 Template




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tomski如图所示将一光�的半圆槽置于光�水平面上槽的左侧有一固定在水平面上的物块.今让一小球自左侧槽口a的正上方从静止开始落下与圆弧槽相切自a点 coloring