Two vectors $\overrightarrow{A}$ and $\overrightarrow{B}$ are acting in the same plane and the vector $\overrightarrow{C}$ is perpendicular to the plane. The resultant of these vectors,

The resultant of the three vectors shown in figure and the angle made by the resultant with $x$-axis is,

A particle $A$ moves along $x$-axis with a uniform velocity of magnitude $10 \mathrm{m} {\mathrm{s}}^{-1}$. Another particle $B$ moves with uniform velocity $20 \mathrm{m} {\mathrm{s}}^{-1}$ along a direction making an angle $60°$ with the positive direction of $x$-axis as shown in the figure. The relative velocity of $B$ with respect to that of $A$ is,