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Question

A body goes 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. The average velocity of the body during the whole journey is

A
zero
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B
25 m/s
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C
24 m/s
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D
none of these
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Solution

The correct option is A zero
Average velocity =Total displacementTotal time
Since, in this case, the particle initial and final points are the same, therefore its Displacement =0.
Average velocity=0

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