Final answer:
Dileep's final displacement is zero because he ends up back at his starting point without needing to walk any additional distance after completing his journey. The correct answer is option (b).
Step-by-step explanation:
When Dileep walks from his home, we need to track his movements to determine his displacement. Initially, he walks 10 km south, then turns right to walk 5 km, which would be west. Turning right again, he walks 10 km north, which brings him back to the same east-west line as his house but 5 km west of it.
Finally, turning left and walking 10 km means he goes east. However, this is different from other scenarios, such as Alan's round trip from home to various points, wherein we calculate both displacement and total distance traveled.
Similarly, we have problems where a student's average speed and velocity are computed based on the total distance and displacement from home to university and back. As opposed to distance, which is the total path length traveled, displacement is a vector quantity that refers to the shortest straight-line distance from the initial position to the final position.