更新1:
Can someone explain to me how they got that answer . Thanks
A velocity vector 50˚ below the positive x-axis has the y-component of -10m/s . It's x-component is ??? Answer is 8.4m/s?
回答 (1)
2016-06-10 2:31 am
✔ 最佳答案
The magnitude of the velocity vector = (10 m/s) / sin50°
The x-component
= [(10 m/s) / sin50°] cos50°
= 10 / tan50° m/s
= 8.4 m/s
https://c2.staticflickr.com/8/7713/27499524231_4824a4a689_o.png
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160609182656AAUe2v9