→ yhliu:How fast is the distance increasing? 163.15.188.87 06/16 17:29
→ yhliu:13ft/s 沒錯! 163.15.188.87 06/16 17:33
A balloon is rising at a constant speed of 5 ft/s. A boy is
cycling along a straight road at a constant speed of 15 ft/s.
When he passes under the balloon it is 45 ft above him.
How fast is the distance between the boy and the balloon
^^^^^^^^^^^^^^^^^^^^^^^^一整個不知道在問什麼!?
increasing 3 seconds later?
這題是要問三秒後的距離嗎!?
如果是的話...這應該是國中的題目吧...
還是說...
是要問他們之間距離增加的速率(ds/dt)??
如果是這樣的話...
我算的答案是 13 ft/s ~~
這答案對嗎!?
※ 編輯: ahongyeh 來自: 219.68.186.165 (06/16 16:54)