為什麼垂直分量的初速是0？
回答 (1)
2016-10-22 11:03 am
✔ 最佳答案
How come it would not be zero?Every object must starts from rest. As it is already said that it is the "initial velocity"(初速), hence it is zero by default.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161020050822AAXLpt8