试题与答案

大伟同学用一个距手3m高的定滑轮拉住重100 N的物体，从滑轮正下方沿水平方向移

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题型：计算题

题目：

大伟同学用一个距手3m高的定滑轮拉住重100 N的物体，从滑轮正下方沿水平方向移动4m，如图所示，若不计绳重和摩擦，他至少做了多少功？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：D

考点：功的计算功的原理
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