某質點的運動是以關係式x=t3－9t2＋24t－10定義，其中x的單位為公尺，而t為秒，試求當t=5秒時的速度為何？(A) 9 m/s (B) 12 m/s (C) 15 m/s (D) 20

問題詳情

19. 某質點的運動是以關係式x=t3－9t2＋24t－10定義，其中x的單位為公尺，而t為秒，試求當t=5秒時的速度為何？
(A) 9 m/s
(B) 12 m/s
(C) 15 m/s
(D) 20 m/s

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