問題詳情
36.小雄以5N的水平力推質量為20kg的行李箱，行李箱水平移動了10m，並具有動能。假設行李箱原來靜止，且在移動時它與水平地面間的摩擦力為4N，則在小雄推動行李箱10m之後，行李箱的動能增加了多少？
(A)10J
(B)20J
(C)30J
(D)40J。
(A)10J
(B)20J
(C)30J
(D)40J。
參考答案
答案：A
難度：適中0.541667
統計：A(13),B(3),C(0),D(6),E(0)
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