AS Daily A Level Physics question
A student walks 300 m east along a straight corridor, then 400 m west along the same corridor. Which statement must be true about the student’s displacement from the starting point?
Answer
The correct answer is B.
Correct: B — The displacement is 100 m west. A confuses displacement with distance; 700 m is the total distance, not the vector change. B is correct because the net change is 400 m − 300 m = 100 m towards the west. C has the right magnitude but the wrong direction. D would only be true if the student returned to the start (equal distances each way), which they did not.