Starting from the origin, a runner covers 2.0km due east in 10min, then 1.0km due west in 5min, and finally runs straight back to the starting point in the next 20min.
(a) Calculate the average speed for the entire 35min run.
(b) Calculate the average velocity for the entire run, giving its magnitude and direction.
(c) Comment on the numerical relationship between the average speed and the magnitude of the average velocity obtained above.