Question

A boy goes from A to B with a velocity of 20 m/s and comes back from B to A with a velocity of 30m/s. Find the average velocity of the body during the whole journey ?

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Answer 1

Given :-

A  boy goes from A to B with a velocity of 20 m/s and comes back from B to A with a velocity of 30m/s.

To Find :-

Average velocity

Solution :-

Total displacement = 0 (Since initial and final points are same)

Let the distance be x

Case 1

Time = Distance/Speed

Time = x/20

Case 2

Time = Distance/Speed

Time = x/30

Now

Avg. velocity = Displacement/Time

Avg. velocity = 0/(x/20 + x/30)

Avg. velocity = 0