72. Dos vectores, $\overrightarrow{\mathbf{V}}_{1}$ y $\overrightarrow{\mathbf{V}}_{2}$, se suman y dan la resultante $\overrightarrow{\mathbf{V}}=\overrightarrow{\mathbf{V}}_{1}+\overrightarrow{\mathbf{V}}_{2}$. Describa $\overrightarrow{\mathbf{V}}_{1}$ y $\overrightarrow{\mathbf{V}}_{2}$ si $\left.\left.a\right) \quad V=V_{1}+V_{2}, b\right) \quad V^{2}=V_{1}^{2}+V_{2}^{2}$, c) $V_{1}+V_{2}=V_{1}-V_{2}$.

 72. Dos vectores, $\overrightarrow{\mathbf{V}}_{1}$ y $\overrightarrow{\mathbf{V}}_{2}$, se suman y dan la resultante $\overrightarrow{\mathbf{V}}=\overrightarrow{\mathbf{V}}_{1}+\overrightarrow{\mathbf{V}}_{2}$. Describa $\overrightarrow{\mathbf{V}}_{1}$ y $\overrightarrow{\mathbf{V}}_{2}$ si $\left.\left.a\right) \quad V=V_{1}+V_{2}, b\right) \quad V^{2}=V_{1}^{2}+V_{2}^{2}$,

c) $V_{1}+V_{2}=V_{1}-V_{2}$.