Question

Does the phrase "direction of zero vector" have physical significance? Discuss it terms of velocity, force etc.

Answer 1

A zero vector has physical significance in physics, as the operations on the zero vector gives us a vector.
For any vector $\overrightarrow{A}$, assume that
$$\begin{gathered} \overrightarrow{A}+\overrightarrow{0}=\overrightarrow{A} \\ \overrightarrow{A}-\overrightarrow{0}=\overrightarrow{A} \\ \overrightarrow{A}\times \overrightarrow{0}=\overrightarrow{0} \end{gathered}$$
Again, for any real number $\lambda$, we have:
$\lambda \overrightarrow{0}=\overrightarrow{0}$
The significance of a zero vector can be better understood through the following examples:
The displacement vector of a stationary body for a time interval is a zero vector.
Similarly, the velocity vector of the stationary body is a zero vector.
When a ball, thrown upward from the ground, falls to the ground, the displacement vector is a zero vector, which defines the displacement of the ball.