問題詳情
13.一質量為60公斤的人站立於標準磅秤上，並同置於電梯中；若磅秤之讀數為63公斤，則此時電梯應處在下列何種運動狀態？
(A)加速下降
(B)等速上升
(C)等速下降
(D)加速上升。
(A)加速下降
(B)等速上升
(C)等速下降
(D)加速上升。
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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