如图所示质量为m的物体以某一初速度v0从a点�下沿光�的轨道运动不计空气 阻力半圆形轨道半径为r若物体通过最低点b的速度为求 � Template




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tomski如图所示质量为m的物体以某一初速度v0从a点�下沿光�的轨道运动不计空气 阻力半圆形轨道半径为r若物体通过最低点b的速度为求 � coloring