Sit}: rJllzl+36r The position of a particle moving along a straight line is represented by the function 5m = t3 121L2 + 361', where distance, 5, is in metres, time, t, is in seconds, and 20. a) The graph of the position function is given. Sketch the graph of the velocin and acceleration functions. b) Detennine when does the particle is rmving to the positive or negative directions