1. The position function of a particle is given by s(1) = 1 - 121 + 451+ 3, where time, t, is in seconds, distance, s, is in metres, and # 2 0. Find the velocity of the particle when the acceleration is zero. (6 marks) 2. The following graph illustrates the position vs time of a moving object. C D F Position B E A Use the graph to answer the following questions: (4 marks) Time a) In what interval(s) is the object moving towards the origin? b) In what interval(s) is the objects' velocity positive? c) When does the object change direction? d) Describe the motion on the interval E-F