gc physics textbook chapter 6 problems (id: b4e2f3688)

本题目来源于试卷: gc physics textbook chapter 6 problems，类别为 IB物理学

[填空题]
How long will it take 4a+b j61tm35 bt7pz6br vflsua 1750ga; 2*zj 0ds d/bx0.lhnbm;x v-W motor to lift a 315-kg piano to a sixth-story window 16.0 m above0xvl n*s.bdz j2gx/ ;hmb0d;a?    s

参考答案: 28.2±2%


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