# Relative motion in 3D (three dimension)

I wanted to ask that is there relative velocity in three dimennsion? if yes then explain it. (Apoorv Katoch asks)

Answer: As we know, motion is relative. Relative velocity can be defined in three dimension also.

Relative velocity is defined as the velocity of one body when the other is assumed to be at rest.

Relative velocity is defined as VBA=VBVwhere VBA is relative velocity of B relative to A

It is true in 1D, 2D or 3D