Extracted text: (b) In a go-kart event, driver no. 5 as shown in Figure 3 starts at s = 0 and then drove with a velocity shown in the v – t graph. Given that the driver no. 5 won the race, find out the acceleration of the go-kart when t = 8 s and t = 12 s. v (m/s) v = 1.25t v = 5 5 v = -1+ 15 1 (s) 10 15