若車初速為 60km h-1 ,停車距離是多少??
更新1:
用錯formula -=-用左 s=[(u+v)/2]*t
簡單phy-0-
回答 (1)
2007-01-28 2:05 am
✔ 最佳答案
u= 30 km/h = 8.333 m/s, v=0 m/s, s = 12m, a=?use v^2 = u^2 + 2a.s
0 = 8.333^2 + 2a(12)
giving a = -2.893 m/s2
Now, u = 60 km/h= 16.667 m/s, v = 0 m/s, a=2.893 m/s2, s=?
use again v^2 = u^2+2.a.s
0 = 16.667^2 +2.(-2.893)s
solve for s gives s = 48 m
收錄日期: 2021-04-29 17:21:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070127000051KK02993