JEE Main & Advanced
Physics
Vectors
Question Bank
Fundamentals of Vectors
question_answer
A hall has the dimensions \[10\,m\times 12\,m\times 14\,m.\]A fly starting at one corner ends up at a diametrically opposite corner. What is the magnitude of its displacement
A) 17 m
B) 26 m
C) 36 m
D) 20 m
Correct Answer:
D
Solution :
Diagonal of the hall = \[\sqrt{{{l}^{2}}+{{b}^{2}}+{{h}^{2}}}\] \[=\sqrt{{{10}^{2}}+{{12}^{2}}+{{14}^{2}}}\] \[=\sqrt{100+144+196}\] \[=\sqrt{400}=20m\]