Question 9 • AP Calculus AB - MA5186 A
Acceleration is the second derivative of position. Differentiating x(t) = –4t³ – 8t² + 16t – 64 twice gives a(t) = –24t – 16. At t = 1, a(1) = –24 – 16 = –40 cm/sec², so the correct choice is –40 cm/sec².
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