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 the rectangular coordinate system
d) displacement vector of a stationary object

Options

A. both a & b
B. both b & c
C. a, b & c
D. both c & d

Answer

D