A signal $V_{M}=5 \sin (\pi t / 3) \mathrm{V}$ is applied to the circuit consisting of a switch $S$ and capacitor $C=0.1 \mu \mathrm{~F}$, as shown in the figure. The output $V_{x}$ of the circuit is fed to an ADC having an input impedance consisting of a $10 \: \mathrm{M} \Omega$ resistance in parallel with a $0.1 \: \mu \mathrm{~F}$ capacitor. If $S$ is opened at $t=0.5 \mathrm{~s}$, the value of $V_{x}$ at $t=1.5 \mathrm{~s}$ will be ___________ $V$ (rounded off to two decimal places).
Note: Assume all components are ideal.
