The sum of two vectors is also a vector. If a vector $\overrightarrow{P}$ is added to another vector equal in magnitude but opposite in direction i.e. $-\overrightarrow{P}$, then the sum of these two vectors is zero. The vector having zero magnitude is called a null vector.
The sum of two vectors is also a vector. If a vector $\overrightarrow{P}$ is added to another vector equal in magnitude but opposite in direction i.e. $-\overrightarrow{P}$, then the sum of these two vectors is zero. The vector having zero magnitude is called a null vector.