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20點!!!物理的題目與方法

Oct 6th 2014, 10:36

1.
平均速度=距離/時間
=385000km/2.5 day
=385000000m/ (2.5*24*60*60) sec
=1782.4 m/s

2. 題意不清，不知道問什麼？
前1200m所花時間 = 1200/6.14 =195.4sec
剩餘300m必須在 4min -195.4sec=44.6sec跑完
後面300m之平均速度=300/44.6 =6.73 m/s
整體平均速度=1500m/4min=6.25m/sec

3.
4.0米/ s的運行100M,所花時間= 100/4 =25sec
5.0米/ s的另一100M,所花時間=100/5 =20sec
總共費時25+20 =45sec
平均速度=200m/45sec =4.4 m/sec

4.題意不清.不知所求

參考資料 ...

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