一半径为r光�的半圆形轨道竖直放置ab为竖直直径一质量为m的小球以某一初速度冲上轨道到b点时小球对轨道压力恰好为零求小球落地点c距a处 Template




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tomski一半径为r光�的半圆形轨道竖直放置ab为竖直直径一质量为m的小球以某一初速度冲上轨道到b点时小球对轨道压力恰好为零求小球落地点c距a处 coloring