起重机在5s内将2×103的物体由静止开始匀加速提升10米,此起重机应

起重机在5s内将2×103的物体由静止开始匀加速提升10,此起重机应具备的最小功率是(g10m/s2)

A40KW      B80KW     C73.6KW     D86.4KW

答案

D

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