問題詳情
1. 若 1 公斤重=10 牛頓，以 40 牛頓的力量將 2 公斤重的物體上提 2 公尺，則施力對物體作功多少焦耳？
(A)20
(B)40
(C)60
(D)80。
(A)20
(B)40
(C)60
(D)80。
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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