Center Of Mass

$-\frac{1}{5} \hat{\mathbf{i}}-\frac{1}{5} \hat{\mathbf{j}}$

$\frac{1}{5} \hat{\mathbf{i}}+\hat{\mathbf{j}}$

$\hat{\mathbf{i}}-\frac{1}{5} \hat{\mathbf{j}}$

$\frac{1}{5} \hat{\mathbf{i}}+\frac{1}{5} \hat{\mathbf{j}}$