就一题.

来源：学生作业学帮网编辑：学帮网时间：2024/05/13 06:00:52

就一题.

你又没说匀速,所以有很多可能.
就当你匀速吧.
力学的角度,3000N动滑轮,实际作用6000N,但是物体只有5000N
效率=5000/6000=86.7%
W=Fh=3000x2x3=18000J
P=W/t=18000/10=1800W

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