用图所示的滑轮组拉物体A 在水平桌面上做匀速直线运动，如果拉力F=3 N ，物体

发布时间：2017-07-26 05:47 │ 来源：www.tikuol.com

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问题：

用图所示的滑轮组拉物体A 在水平桌面上做匀速直线运动，如果拉力F=3 N ，物体A的速度v=0.2m/s ，忽略滑轮重、绳重和轴摩擦．下列说法中正确的是

[ ]

A．物体A 受到合力不为零

B．物体A 受到的拉力为9N

C．竖直墙受到的拉力为9N

D．拉力F 每秒钟做功为1.8 J

考点：滑轮（组）中拉力的计算功的计算

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完形填空。
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