Question

A train takes 2 h to reach station B from station A, and then 3 h to return from station B to station A. The distance between the two stations is 200 km. Find : (i) the average speed, (ii) the average velocity of the train.

Answer 1

Total distance $D=200+200=400km$

Average speed $|V_{avg}|=\frac{Totaldistance}{Totaltime}$

$\therefore |V_{avg}|=\frac{400}{2+3}=80km/h$

Displacement $S=0$

Average velocity $V_{avg}=\frac{Totaldisplacement}{Totaltime}$

$\therefore V_{avg}=\frac{0}{2+3}=0km/h$