問題詳情
20.某物作自由落體，已知落下第1秒內的距離是落地前1秒內的，則某物著地共費時多少秒？
(A)
(B)
(C)
(D)5
(E)6
(A)
(B)
(C)
(D)5
(E)6
參考答案
答案：B
難度：困難0.222222
統計：A(5),B(2),C(1),D(1),E(0)
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