The displacement (in meters) of a particle moving in a straight line is given by s = t2 - 9t + 17, where t is measured in seconds. (a) Find the average velocity over each time interval. (i) [3, 4] 1 x m/s (ii) [3.5, 4] 2 |× m/s (iii) [4, 5] 2 X m/s (iv) [4, 4.5] 4 X m/s (b) Find the instantaneous velocity when t = 4. 2-1 x m/s

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