A runner starts from point A on a semicircular track of radius 14m, runs along the curved path to point B (the diametrically opposite end), and then continues straight along the diameter from B to the centre O of the circle.
(i) Calculate the total distance covered by the runner.
(ii) Determine the magnitude of the displacement of the runner from point A to point O.
(iii) If the entire motion takes 50s, compute the average speed and the magnitude of the average velocity.
(iv) Which of the two averages obtained in part (iii) is larger? Explain briefly why this is so for the given path.