Question

A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30
m/min. The average velocity of the boy during the whole journey is
(a) 24 m/min
(6) 25 m/s
(c) Zero
(d) 20 m/min
O
(a)
(b)
O
(C)
O
(d)​

Answer 1

Displacement in this case is zero 0, since he started and returned to the same point.
Hence average velocity= Total Displacement /Time
Average Velocity= 0 (As total displacement is zero)

Answer 2

SOLUTION

TO CHOOSE THE CORRECT OPTION

A boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min. The average velocity of the boy during the whole journey is

(a) 24 m/min

(b) 25 m/s

(c) Zero

(d) 20 m/min

EVALUATION

Here it is given that a boy goes from A to B with a velocity of 20 m/min and comes back from B to A with a velocity of 30 m/min.

So the boy comes back to the initial position

∴ Initial position = Final Position

Displacement

= Final Position - Initial position

= 0

Hence the required average velocity of the boy during the whole journey

$\displaystyle \sf{ = \frac{Total \: displacement}{Total \: time } }$

$\displaystyle \sf{ = \frac{0}{Total \: time } }$

$\displaystyle \sf{ = 0}$

FINAL ANSWER

Hence the correct option is (c) Zero

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