For an airplane flying in a vertical plane, the angle of attack is $3^{\circ},$ the horizontal and vertical components of velocity in wind axis are $300 \mathrm{~km} / \mathrm{h}$ and $15.72 \mathrm{~km} / \mathrm{h}$, respectively. The pitch attitude of the airplane is_________ degrees (round off to 2 decimal places).
For an airplane flying in a vertical plane, the angle of attack is $3^{\circ},$ the horizontal and vertical components of velocity in wind axis are $300 \mathrm{~km} / \mathrm{h}$ and $15.72 \mathrm{~km} / \mathrm{h}$, respectively. The pitch attitude of the airplane is_________ degrees (round off to 2 decimal places).