A athlete starts from the south-west corner of a rectangular field that is 120m long and 70m wide. He runs along the boundary, first covering the entire length toward the east, then the entire width toward the north, and finally half the length toward the west before stopping.
(a) Sketch the path taken and mark the initial and final positions.
(b) Calculate the total distance the athlete has run.
(c) Determine the magnitude of the displacement from the starting point to the stopping point.
(d) Hence find the average speed and the average velocity if the entire run took 50s.