Question

A body goes from P to Q with a velocity of 40 m/s and comes back from Q to P with a velocity of 60m/s. What is the average velocity of the body during the journey?

Answer 1

${velocity}_{avg}=\frac{Totaldisplacement}{Totaltime}$

Here body goes from P to Q and comes back to P from Q, so here initial and final position
are same therefore displacement becomes zero.
As displacement becomes zero therefore average velocity also becomes zero.