\textbf{162.} The velocity of a 2kg ball changes from $\vec{V}_1 = 10\hat{i} - 8\hat{j}$ to $\vec{V}_2 = 6\hat{i} - 5\hat{j}$ (in SI units) under a constant force. If the time of force application is $\frac{1}{10}$ seconds, the magnitude of the force is how many Newtons?
\hspace{1cm} (1) $10$ \hspace{2cm} (2) $12$ \hspace{2cm} (3) $15$ \hspace{2cm} (4) $20$