問題詳情
2. ( )如圖，一木塊放在水平光滑面上，今施一 牛頓與水平成 30°的拉力使之移動 公尺，則拉力對木塊作功為若干焦耳？
(A)
(B)
(C)
(D) 1000
。 
(A)
(B)
(C)
(D) 1000
。
參考答案
答案：B
難度：困難0.3
統計：A(2),B(3),C(2),D(0),E(0)
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