Answer:
4 Km
Step-by-step explanation:
Displacement is 4 Km because it only refers to the object´s initial and final position, for example if the object returns to the same position from which it left, its displacement is zero. In this case the object´s initial position is zero and its final position is 4, then the difference of final and initial point is (4 Km – 0 Km)= 4 Km
Displacement is defined as the change in position, the displacement horizontal can be called Δx, then is a net change, and it differs in magnitude from total distance traveled.