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範例:v-t圖之應用

一火箭由地面加速直線上升,燃料用盡後落回地面,如火箭的垂直速度與時間的關係,如圖所示。(a)火箭在上升期間,加速度的情形如何?加速度有多大? (b)火箭在何處,以最大速度爬升? (c)火箭上升的最大高度是多少公里? (d)KàLàM,加速度若干? (e)M處的速度是多少?(注意ΔOKL面積等於ΔLMN)(J=10;L=50)


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