Kinematics Question 145
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 it’s incorrect [HP PMT 1999]
Options:
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
Correct Answer: B Displacement $ \overrightarrow{AC}=\overrightarrow{AB}+\overrightarrow{BC} $ $ AC=\sqrt{{{(AB)}^{2}}+{{(BC)}^{2}}}=\sqrt{{{(400)}^{2}}+{{(300)}^{2}}}=500m $ distance $ =AB+BC=400+300=700m $
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