Question

A man goes from A to B at speed & returns from B to A at speed. Find

i) Average velocity

ii) Average speed​

Answer 1

Answer:

2(V1V2)/(V1+V2)

Explanation:

speed : A to B : V1

speed : B to A : V2

distance : d ( same in both cases)

time t1 = d/V1

time t2 = d/V2

total distance : D = d + d = 2d

total time : t = t1 + t2 = d(V1+V2)/(V1V2)

avg speed = D/t = 2(V1V2)/(V1+V2)