問題詳情
31.質量 kg 之物體靜止置於光滑水平面上，先受 20N 向北的定力作用秒，再改受另一 30N 向東的定力作用其上2秒之後，物體之速度大小為多少m/s？
(A)20
(B) 14
(C)
(D) 8
(A)20
(B) 14
(C)
(D) 8
參考答案
答案：A
難度：非常困難0
統計：A(0),B(0),C(0),D(0),E(0)
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