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题目如图1,一条不可伸长的细线跨过定滑轮,连着物体 A 和 B,物体 B 竖直悬挂,物体 A 在外力作用下沿水平面向右匀速运动,则下列说法正确的是
The problem is shown in Fig. 1. An inextensible thin line straddling the fixed pulley connects object A and B. Object B hangs vertically and object A moves along the horizontal surface to the right under external force. The following statement is correct.