問題詳情
1. 用繩子將質量m的木塊以1/3g的等加速度鉛直放下一段距離h，則繩對木塊作功為
(A) 1/3mgh
(B) －1/3mgh
(C) 2/3mgh
(D) －2/3mgh
(E) －mgh。
(A) 1/3mgh
(B) －1/3mgh
(C) 2/3mgh
(D) －2/3mgh
(E) －mgh。
參考答案
答案：D
難度：非常困難0
統計：A(0),B(2),C(0),D(0),E(0)
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