1. A rocket produces the acceleration-time curve shown below as it com- pletes the burn of its first and second stages. Initial velocity and po- sition are zero. Plot v-t, s-t graphs and determine the position and velocity of the rocket after 120 seconds. 30 20 a(t) Acceleration (m/s?) 10 0 20 40 60 80 100 120 Figure 1: Prob. 1