An athlete runs on a standard circular track of length 400 m. Starting from the eastern end, she completes 2.5 laps in 5 minutes and then stops.
(a) Calculate the distance she has travelled.
(b) Determine the magnitude of her net displacement from the starting point.
(c) Identify which of the two quantities obtained in (a) and (b) are scalars and which are vectors, giving a brief justification based on directionality.
(d) Explain why the numerical values of distance and displacement differ in this case.