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A hall has the dimensions 10 m xx 12 m x...

A hall has the dimensions `10 m xx 12 m xx 14 m`. A fly starting at one corner ends up at a diagonally opposite corner. What is the magnitude of its displacement

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If the starting point of fly which is one corner of room is taken as origin of coordinates, then the coordinates of diametrically opposite corner of room are (3, 4, 5). So’ displacement is `vecr=3hati+4hatj+5hatk and r=sqrt(3^(2)+4^(2)+5^(2))=sqrt50=7m`
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