App. of Definite Integrals

2010-11-09 2:33 am

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1a)我計到60mins
b)計到0 - -'

唔知岩唔岩?
如果唔岩, 請列明步驟! thx
更新1:

這條是Definite Integrals, 唔係應該搵upper / lower limit? if the ans of (a) 30 , it should be the upper limit? (b) 我可以寫!? 30 Integrate 0 (240-8t) dt       30 =[240t-4t^2]       0 =240*30-4(30)^2 =3600 m

回答 (1)

2010-11-09 3:24 am
✔ 最佳答案
你的答案錯了。

(a) lLet 240-8t=0=>t=30
So, after 30 minutes, the boat will come to rest.

(b) Displacement= Integrate (240-8t) dt
=240t-4t^2+C

When t=0, displacement=0=>C=0

Then, the total displacement of the boat is 240*30-4(30)^2=3600 m

2010-11-09 17:47:32 補充:
Right


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