A particle moves in a straight line from `A` to `B` with speed `v_(1)` and then from `B` to `A` with speed `v_(2)`. Find the average velocity and average speed.

Explanation

Here, displacement =0, average velocity =0
Averge speed `=(d+d)/(d/v_(1)+d/v_(2))=(2v_(1)v_(2))/(v_(1)+v_(2))`