Question

A person starts walking and comes back to his initial position after 2 hours. Which of the following quantities will be zero?

• A. Average speed
• B. Time
• C. Displacement
• D. Path length

Answer 1

The correct option is C Displacement

• The displacement will be zero because the initial and final positions are the same.
• The path length will be non-zero.
• The time will keep on increasing.
• Average speed will be non-zero too.

Average speed $=\frac{\text{total distance}}{\text{total time}}$

The total distance and total time taken are both non-zero, so average speed will also be non-zero.

Answer: option (C)