Answer: D. 0 m
Explanation:
<u>Concept:</u>
Here, we need to know the concept of displacement.
Displacement is defined to be the change in position of an object.
The difference between displacement and distance is the total movement of an object without any regard to direction, while displacement is the pure change of position.
If you are still confused, please refer to the attachment below for a graphical explanation.
<u>Solve:</u>
<em>STEP ONE: the boy walks from point C to point D (a distance of 50 m)</em>
C ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ D
50 m
<em>STEP TWO: the boy walks from point D to point C (a distance of 50 m)</em>
D ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ ⇒ C
50 m
<em>STEP THREE: find the displacement</em>
The boy <u>started </u>with point C
The boy <u>ended </u>with point C
He did not change his position throughout the journey.
Therefore, his displacement is <u>0 m</u>.
Hope this helps!! :)
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