Answer:
In terms of distance, average speed is 20 km/h
In terms of displacement, average speed is 0 km/h.
Explanation:
Total distance:
[tex] = (40.0 - 10.0) + (20.0 - 10.0) + (40.0 - 20.0) \\ = 30.0 + 10.0 + 20.0 \\ = 60.0 \: km[/tex]
Total time is 3.0 hours
but:
[tex]average \: speed = \frac{total \: distance}{total \: time} \\ [/tex]
In terms of distance.
substitute:
[tex]average \: speed = \frac{60.0}{3.0} \\ \\ = 20 \: {kmh}^{ - 1} [/tex]
[tex]displacement = ( - 30.0) + 10 .0+ 20.0 \\ = 0[/tex]
In terms of displacement:
[tex]speed = \frac{0}{3} \\ \\ = 0 \: {kmh}^{ - 1} [/tex]
