An insect is taking rounds around a triangle in anti-cloclwise direction with a speed of 1m/s. The insect starts from A at t = 0. Find its displacement at t = 17 sec.
A
12 m
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B
zero
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C
√13 m
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D
5 m
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Solution
The correct option is C√13 m
Perimetre is 12 m. After 17 s, it makes one complete rotation and 5 m into the second rotation. From the figure, the displacement is √32+22=√13.