Mathematics - Vector Question with Solution | TestHub

The resultant of two forces $\mathrm{P}\mathrm{N}$ and $3\mathrm{N}$ is a force of $7\mathrm{N}$. If the direction of $3\mathrm{N}$ force were reversed, the resultant would be $\sqrt{19}\mathrm{N}$. The value of $\mathrm{P}$ is