Question

a student walks to the mailbox (50 meters away) and back. their displacement is...
100 m
not enough info
50 m
0 m

Explanation:

Step1: Define displacement

Displacement is the straight-line distance from the starting position to the final position, including direction.

Step2: Analyze the student's path

The student starts at a point, walks 50 m to the mailbox, then walks 50 m back to the starting point.

Step3: Calculate net displacement

Final position = starting position, so displacement = $0$ m.

Answer:

0 m