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Question

A body goes from C to D with a velocity of 20 ms1 and comes back from D to C with a velocity of 30 ms1. The average velocity of the body during the whole journey is _______.

A
25 ms1
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B
0
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C
20 ms1
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D
21 ms1
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Solution

The correct option is B 0
Given, initial velocity, u=20 ms1 and final velocity, v=30 ms1.

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.

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