標題: 有關u v a s t 的問題 [打印本頁] 作者: waistyle 時間: 10-10-31 12:42 PM
標題: 有關u v a s t 的問題
A train approaches a station and slows down steadily at 2.5ms^-2 .
The front and the end of the train pass a woman on the platform with a time lapse 4s .
If the length of the train is 40m what is its initial velocity?作者: AYuMe 時間: 10-10-31 02:02 PM
s = ut + 0.5at^2
40 = 4u + 0.5(-2.5)(4^2)
60 = 4u
u = 15ms^-1
應該是這樣?因為我用中文讀物理的-w-不太肯定有無解錯題作者: 雪子秀 時間: 10-11-1 01:33 AM
