如图所示沿竖直杆以速度υ匀速下�的物体a通过轻质细绳拉光�水平面上的物体b当细绳与竖直杆间的夹角为θ时物体b的速度为 A.υ Template




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tomski如图所示沿竖直杆以速度υ匀速下�的物体a通过轻质细绳拉光�水平面上的物体b当细绳与竖直杆间的夹角为θ时物体b的速度为 a.υ coloring