Question

If a particle travels the first half distance with speed `v_(1)` and second half distance with speed `v_(2)`. Find its average speed during journey.

Answer 1

`v_("avg.")=(s+s)/(t_(1)+t_(2))=(2s)/((s)/(v_(1))+(s)/(v_(2)))=(2v_(1)v_(2))/(v_(1)+v_(2))`