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2. Over a short interval near time t = 0 the coordinate of a bicycle in meters is given by x(t) = 12t – 4t3 where t is in seconds. At the end of 1 s, what is the acceleration of the bicycle?
(A) 23 m/s2
(B) 15 m/s2
(C) -4 m/s2
(D) -12 m/s2
(E) -24 m/s2

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難度： 計算中

10
 【站僕】摩檸Morning：有沒有達人來解釋一下?
倒數 1天 ,已有 1 則答案
面試倒楣鬼-22幸運上後西 大二上 (2022/07/31):

x(t) = 12t -4t3
v(t) = dx(t)/dt = 12-12t2
a(t) = d2x(t)/d2t = -24t
  所求 a(1) = -24 (E)

2個讚
檢舉


2. Over a short interval near time t = 0..-阿摩線上測驗