\textbf{188.} The equation of simple harmonic motion in SI is $x = 0.04\sin 10\pi t$. If the mass of the oscillating object is 200 grams, what is the equation of elastic potential energy with respect to time in SI? $(\pi^2 = 10)$
\begin{align*}
&(1)\quad u_e = 0.04\sin^2 10\pi t \qquad\qquad (2)\quad u_e = 0.04\cos^2 10\pi t\\
&(3)\quad u_e = 0.16\sin^2 10\pi t \qquad\qquad (4)\quad u_e = 0.16\cos^2 10\pi t
\end{align*}