同s=ut+1/2at^2
e.g.5=10t+1/2(-10)t^2 點計
要解釋詳盡,thx
更新1:
我唔知幾時用邊條式
math&phy questions
回答 (1)
2008-10-15 2:18 am
✔ 最佳答案
5=10t-5t^25t^2-10t+5=0
use formula: (a-b)^2 = a^2 - 2ab +b^2
(t*sqrt5 - sqrt5)^2 = 0
t*sqrt5 = sqrt5
t=1
收錄日期: 2021-04-23 18:08:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20081011000051KK01855