圖片參考:http://img695.imageshack.us/img695/5783/0005ti.jpg
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