2. Over a short interval near time t = 0 the coordinate of a bicycle in meters is given byx(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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