Question

A body move from A to B with a velocity of 20 m/s and comes back from B to A with a velocity of 30 m/s.Their average velocity of the body during the whole journey is : *

Answer 1

Answer:

Explanation:

let distance be d metres..

if Vab=20m/s,t=d/Vab=d/20s

if Vba=30m/s,t=d/Vba=d/30s

therefore average velocity=d+d/(d/20+d/30)=2d*60/5d=24m/s