Question

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
• B. zero
• C. $\sqrt{13}$ m
• D. 5 m

Answer 1

The correct option is C $\sqrt{13}$ 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 $\sqrt{3^2+2^2}=\sqrt{13}.$