Answer:
Option D is the correct answer.
Explanation:
Total distance cannot be zero for the options given. The question should be total displacement.
Let positive X axis represents forward direction of basket ball player and negative X axis represents backward direction of basket ball player.
We have horizontal component along X axis represented by unit vector i.
Option A
The player runs 9 meters forward and then runs 0 meters in the opposite direction
Total displacement = 9 i - 0 i = 9 i m
Option B
The player runs 5 meters forward and then runs 6 meters in the opposite direction
Total displacement = 5 i - 6 i = -1 i m
Option C
The player runs 6 meters forward and then runs 5 meters in the opposite direction
Total displacement = 6 i - 5 i = 1 i m
Option D
The player runs 4 meters forward and then runs 4 meters the opposite direction
Total displacement = 4 i - 4 i = 0 i m
From the above values it is clear that the magnitude of option D is zero, all other displacement has non negative magnitude.
So, Option D is the correct answer.
