Question

Which of the following is a null vector?

• A. Velocity vector of a body moving in a circle with a uniform speed
• B. Velocity vector of a body moving in a straight line with a uniform speed
• C. Position vector of the origin of a rectangular coordinate system
• D. Displacement vector of a stationary object
  

Answer 1

Answer: (C), (D)

Displacement vector of a stationary object


A vector with zero magnitude but the certain direction is known as a null vector. If $\overrightarrow{A}$ is a vector than $|\overrightarrow{A}|=0$, It means that the vector is pointing in a certain direction but is still there.