A particle moves in the x-y plane under the influence of a force such that its linear momentum is $\overrightarrow{\mathbf{p}}\left(\mathrm{t}\right)=\mathrm{A}[\hat{\mathrm{i}}\cos (\mathrm{kt})-\hat{\mathrm{j}}\sin (\mathrm{kt}\left)\right]$ , where A and k are constants. Angle between the force and the momentum is: