Answer
$$37^{\circ}
$$
Work Step by Step
The phase constant for the resultant is
$$
\phi=\tan ^{-1}\left(\frac{y_{m v}}{y_{m h}}\right)=\tan ^{-1}\left(\frac{y_{1} / 2}{2 y_{1} / 3}\right)=\tan ^{-1}\left(\frac{3}{4}\right)=0.644 \mathrm{rad}=37^{\circ}
$$
