16. Find '(1) if f(x) = 2x - 1 x+ 2 a. C. aly WIN SIU b. d. 17. The position function of an object is given by s() = 215 - 121 + 301+ 8, where time, 1, is in seconds and distance, s, is in metres. What is the object's acceleration at / = 1? a. 12 m/s' c. 20 m/s' b. -12 m/s- d. 0 m/s 18. The position function of an object is given by s() = -4.9 + 19.6+ 2, where time, I, is in seconds and distance, s, is in metres. When is the object momentarily at rest? a. at 2 s c. at 3 s b. at l s d. at Os