如图所示abc是光�轨道bc段是半径为 R 的半圆弧bc直径竖直今让一小球从a点由静止开始沿轨道abc运动则 A小球恰能到达c点 Template




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tomski如图所示abc是光�轨道bc段是半径为 r 的半圆弧bc直径竖直今让一小球从a点由静止开始沿轨道abc运动则 coloring