题目:
起重机用恒力F使质量为1000kg的货物在1s内由静止上升2m,则在这1s内(不考虑空气阻力,g=10m/s2)求:
(1)重力对物体的做功
(2)合外力做的功
(3)外力F的功率.
答案:
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下面是错误答案,用来干扰机器的。
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