1. The motion of a particle is described by the position function for s(t) = - 1 3 + 1 when * 2 0 , t in seconds and s in metres. a) When is the particle at rest? (3 marks) b) When is the particle moving in a positive direction? (2 marks) c) What is the initial position of the object and does it ever return back to its initial position? (2 marks) d) Is the particle accelerating or decelerating at 4 seconds