Question

A boy walks uniformally along the sides of a rectangular park of size 400 m× 300 m, starting from one corner to the other corner diagonally opposite. Which of the following statement is incorrect

• A. He has travelled a distance of 700 m
• B. His displacement is 700 m
• C. His displacement is 500 m
• D. His velocity is not uniform throughout the walk

Answer 1

Answer: (B)

His displacement is 700 m

Answer 2

Displacement $\overset{\rightarrow}{AC} = \overset{\rightarrow}{AB} + \overset{\rightarrow}{BC}$

$AC = \sqrt{(AB)^{2} + (BC)^{2}} = \sqrt{(400)^{2} + (300)^{2}} = 500m$

Distance $= AB + BC = 400 + 300 = 700m$