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| 如果你忘記伊莉的密碼,請在登入時按右邊出現的 '找回密碼'。輸入相關資料後送出,系統就會把密碼寄到你的E-Mail。 When the traffic light turns green, a car accelerates from rest at a rate of 2.0ms-2. At the same time, a truck, moving at a constant speed of 10ms-2, passes the traffic light, which just turns green, and overtakes the car. Since the car moves with increasing speed, it will overtake the truck some times later.
(a) At what distance from the traffic light will the car overtake the truck?
(b) What is the speed of the car at that instant? |
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