問題詳情
2. A 70 kg person stands on one end of a one-meter long board. The board is uniform and weighs 100 kg.How far is the center of mass of the system “person on board” from the person?
(A)0.1m
(B)0.3 m
(C) 0.5 m
(D) 0.8 m
(E) 0.9 m
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)