我提一桶水上到10楼和我提一桶水从10楼下到一楼,做功一样多吗?为什么
问答/399℃/2024-11-02 20:15:53
优质解答：
绝对值一样,但上楼时力与力方向上位移位移方向一致,做功为正值；下楼时力与位移方向相反,做功负值.
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