問題詳情
4. 甲於湖岸邊泡腳，一艘快艇於湖面上距岸邊40
公尺等速沿著岸邊行駛，若艇尾水波（水花）張角為90°，水波速度為10m/s，則：
(1)快艇速度大小為？(3分)
公尺等速沿著岸邊行駛，若艇尾水波（水花）張角為90°，水波速度為10m/s，則：(1)快艇速度大小為？(3分)
參考答案
答案：D
難度：非常簡單0.979856
統計：A(57),B(37),C(21),D(5594),E(0)
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