题目：
如图所示，重为100N的物体在水平方向上以1m/s的速度做匀速直线运动，弹簧秤求数为5N（不计绳与滑轮的摩擦）．求：
（1）作用在滑轮上的水平拉力F；
（2）拉力F的功率．
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
如图所示，重为100N的物体在水平方向上以1m/s的速度做匀速直线运动，弹簧秤求
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