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A hall has the dimensions $10 \mathrm{~m} \times 12 \mathrm{~m} \times 14 \mathrm{~m}$. A fly starting at one corner ends up at a diametrically opposite corner. What is the magnitude of its displacement
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The correct answer is:
$20 \mathrm{~m}$
Diagonal of the hall $=\sqrt{l^2+b^2+h^2}$
$=\sqrt{10^2+12^2+14^2}$
$=\sqrt{100+144+196}$
$=\sqrt{400}=20 \mathrm{~m}$
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