A student leaves home, walks 600m east to the bus stop, then rides the bus in a semicircular route of radius 300m and finally gets down exactly in front of the school gate situated 600m due east of the starting point.
(i) Explain, without using numerical calculation, whether the distance covered by the student is greater than, equal to, or less than the magnitude of the displacement.
(ii) Identify one section of the journey where the distance covered increases but the magnitude of displacement remains unchanged. Give a reason for your choice.
(iii) If the student returns home by exactly retracing the same path after school, what will be the total distance travelled and the magnitude of the net displacement for the entire day? Explain your answer.