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Q.

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?

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a

Zero

b

25 m / s

c

24 m / s

d

None of these

answer is A.

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Detailed Solution

The average velocity of the body during the whole journey is zero.

Average velocity = \frac{Total displacement}{total time}

Since the particle's initial and final locations are identical in this instance, its displacement

= 0

. Therefore, average velocity

= 0

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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?