問題詳情
46.依下圖所示的方法甲、乙、丙，利用繩索將同一物體從地面拉到高度 h 的位置。假設滑輪平穩轉動，物體與斜面之間的摩擦、以及滑輪和繩索的質量可忽略不計。甲：利用定滑輪乙：利用定滑輪與動滑輪丙：利用斜面依上述的方法甲、乙、丙慢慢地向上拉起來時，用力拉繩索所作的功分別為 W 甲、W 乙、W 丙，有關這三者的大小關係，下列何者正確？
(A)W甲 ＞ W乙 ＞ W丙
(B)W甲 = W乙 ＞ W丙
(C)W甲 = W乙 = W丙
(D)W甲 ＜ W乙 ＜ W丙
(A)W甲 ＞ W乙 ＞ W丙
(B)W甲 = W乙 ＞ W丙
(C)W甲 = W乙 = W丙
(D)W甲 ＜ W乙 ＜ W丙
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