Answer: Student's displacement = 1.5 km North ( Option B)
Explanations:
Distance walked through North = 2.5 km
Distance walked through South = 1.0 km
Considering that the North and the South are in vertical directions to each other, it means the student first walked 2.5 km upwards (North), and then traced his way 1.0 km back downwards(South).
The Student's displacement = Distance across North - Distance across South
Student's displacement = 2.5 - 1.0
Student's displacement = 1.5 km North km upwards