（2013·绍兴）如图甲，物体A在水平拉力F的作用下，以0.

更新 2022-09-03
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挑错有奖

（2013·绍兴）如图甲，物体A在水平拉力F的作用下，以0.2米/秒的速度在水平面上作匀速直线运动，此时弹簧秤示数如图乙所示。若不计滑轮、弹簧秤和绳的重及滑轮与绳之间的摩擦，则下列说法中正确的是( )

A．拉力F为2牛

B．此滑轮是定滑轮

C．拉力F的功率为0.4瓦

D．以物体A为参照物，弹簧秤是静止的

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