Question

While John is traveling along a straight inter-
state highway, he notices that the mile marker
reads 257 km. John travels until he reaches
the 145 km marker and then retraces his path
to the 175 km marker.
What is John's resultant displacement from
the 257 km marker?
Answer in units of km.

Answer 1

Answer:

Explanation:

The first displacement when the mile reading changes from 257 to 145

= 257 - 145

= 112 km

Then he turns back . This time the displacement will be negative .

The mile reading changes from 145 to 175

displacement = - ( 175 -  145 )

= - 30 km

Final displacement = 112 - 30

= 82 km .