physics
回答 (1)
2008-04-09 6:47 am
✔ 最佳答案
s = 10 + 20 = 30mt = 5s
u = 0m/s
s = ut + (at^2)/2
30 = a(5^2)/2
a = 60/25 = 2.4 ms^-2
收錄日期: 2021-04-13 15:24:46
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