A body goes from C to D with a velocity of $20 m s^{- 1}$ and comes back from D to C with a velocity of $30 m s^{- 1}$ . The average velocity of the body during the whole journey is _______.

25 m s^{- 1}

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0

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20 m s^{- 1}

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21 m s^{- 1}

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Solution

The correct option is B $0$
Given, initial velocity, $u = 20 m s^{- 1}$ and final velocity, $v = 30 m s^{- 1}$ .

We know, $a v e r a g e v e l o c i t y = \frac{total displacement}{total time}$ .

In this problem, as the body comes back to the initial position, the total displacement is zero.

Therefore, average velocity = $0$ .

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A body goes from C to D with a velocity of 20 ms−1 and comes back from D to C with a velocity of 30 ms−1. The average velocity of the body during the whole journey is _______.

The correct option is B 0Given, initial velocity, u=20 ms−1 and final velocity, v=30 ms−1. We know,average velocity=total displacementtotal time. In this problem, as the body comes back to the initial position, the total displacement is zero. Therefore, average velocity = 0.

A body goes from C to D with a velocity of $20 m s^{- 1}$ and comes back from D to C with a velocity of $30 m s^{- 1}$ . The average velocity of the body during the whole journey is _______.