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
- AHe has travelled a distance of $700\, m$
- BHis displacement is $700 \,m$
- CHis displacement is $500\, m$
- DHis velocity is not uniform throughout the walk
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- [AIIMS 2009]
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