試題詳解

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