問題詳情
18. 某物體在光滑水平面上同時受三個水平力而等速運動，已知其中兩力大小皆為F，夾角為120°，則第三力之大小為：
(A)
F
(B) F
(C)√2F
(D)√3F
(E) 2F。
(A)
F (B) F
(C)√2F
(D)√3F
(E) 2F。
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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