Can someone explain these statements?(all T)
1) A body can have zero velocity but also be accelerating.
2)A body can have a constant speed but a varying velocity.
The more detailed the better ,thx =]
motion phy
2007-08-30 10:55 am
回答 (1)
2007-08-30 11:00 am
✔ 最佳答案
1. 試想像一個物體，你將佢拋起，當佢去到最高點時，velocity係0，但係acceleration係等於個gravity2. speed 係scalar 但velocity係一個vector，當係一部車，用20 meter per second行緊一個圓圈，佢個speed(20 meter per second) 不變，但方向改變，所以velocity變 (因為velocity係vector 係計埋向量的)
參考: 我的中七物理知識
收錄日期: 2021-04-13 13:11:25
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https://hk.answers.yahoo.com/question/index?qid=20070830000051KK00597