4. [2.4) a) Sketch a position-time graph that involves acceleration, turning around, deceleration, and a full stop. b) Label each part of the graph from part a. [6] 5. [2.3] a) Roughly sketch a function that has a point where the instantaneous rate of change cannot be determined. b) State at which location the instantaneous rate of change cannot be determined on your function from part a). c) Explain why the instantaneous rate of change cannot be determined at that point. [3]