A particle undergoing simple harmonic motion has time dependent displacement given by $x ( t ) = \mathrm { A } \sin \frac { \pi t } { 90 }$. The ratio of kinetic to potential energy of this particle at $t = 210 s$ will be\\
(1) $\frac { 1 } { 9 }$\\
(2) 1\\
(3) 2\\
(4) $\frac { 1 } { 3 }$