b如图所示一光�的半径为r的半圆形轨道固定在水平面上一质量为m的小球以某一速度从a点冲上轨道当小球将要从轨道口b点水平飞出时小球对 Template




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tomskib如图所示一光�的半径为r的半圆形轨道固定在水平面上一质量为m的小球以某一速度从a点冲上轨道当小球将要从轨道口b点水平飞出时小球对 coloring