$\Rightarrow \frac{m}{K} = \frac{x}{g}$
So $T = 2\pi \sqrt {\frac{m}{K}} = 2\pi \sqrt {\frac{x}{g}} = 2\pi \sqrt {\frac{{0.2}}{{9.8}}} = \frac{{2\pi }}{7}\sec $

Statement $I :$ A second's pendulum has a time period of $1$ second.
Statement $II :$ It takes precisely one second to move between the two extreme positions.
In the light of the above statements, choose the correct answer from the options given below:

$\vec r = (\sin \,t\,\hat i\, + \,\cos \,t\,\hat j\, + \,t\,\hat k)m$
Find time $'t'$ when position vector and acceleration vector are perpendicular to each other
(Round off to the Nearest Integer)