9.如图5 6所示物体a以速度v沿竖直杆匀速下�物体b用绳跨过�轮与a相连当绳与水平面成θ角时物体b的速率为 . 图5 6——青夏教育 Template




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tomski9.如图5 6所示物体a以速度v沿竖直杆匀速下�物体b用绳跨过�轮与a相连当绳与水平面成θ角时物体b的速率为 . coloring