n n 100 Prob. 12-46 s (ft) e n n n n n e e 12-47. A two-stage rocket is fired vertically from rest at s = 0 with the acceleration as shown. After 30 s the first stage, A, burns out and the second stage, B, ignites. Plot the -t and s-t graphs which describe the motion of the second stage for 0160s. a (m/s²) B 224 24 A 12 12 30 60 Prob. 12-47 t(s)