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A runner traveled 15kometers north then backtracked 11 kilometers south before stopping. His resultant desplacement was

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MalakMselg
Since he went and came back in the same line you can simply subtract them
15-11 = 4km
AL2006

Displacement is the distance AND DIRECTION from the starting point to the finish point, no matter what the route from start to finish may have been.

THIS runner's displacement was 4 kilometers north.

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