While John is traveling along a straight inter-

state highway, he notices that the mile marker

/reads 256 km. John travels until he reaches

the 138 km marker and then retraces his path

to the 173 km marker.

What is John's resultant displacement from

the 256 km marker?

Answer in units of km.

83km

Explanation:

Distance from the 256km marker to 138km marker ... is (256 - 138) = 118km

Then when he traces back to the 173km marker ... he moves (173 - 138) = 35km but its in the opposite direction ... so hence ... its - 35km (since when calculating displacement ... direction has to be accounted for) ...

Total displacement from the 256km marker

; 118 + (-35) = 83km