The motion of object with respect to other moving or stationary object is called?

The correct answer is Relative velocity.

CONCEPT:

• Constant velocity: The object having a constant speed in a constant direction is called as a constant velocity
  • Constant direction constrains the object to motion in a straight path thus, a constant velocity means motion in a straight line at a constant speed.
• Relative velocity: It is the velocity of an object or observer B in the rest frame of another object or observer A.
  • For example, a boat crosses a river that is flowing at some rate, or an airplane encountering wind during its motion.
• Instant velocity: It is the quantity that tells us how fast an object is moving anywhere along its path is the instantaneous velocity.
  • It is the average velocity between two points on the path in the limit that the time between the two points approaches zero.
• Terminal velocity: It is the steady speed achieved by an object freely falling through a gas or liquid.
  • An object dropped from rest will increase its speed until it reaches terminal velocity.
• An object forced to move faster than its terminal velocity on releasing will slow down to this constant velocity.

EXPLANATION:

• As per the above discussion, it's clear that the motion of an object with respect to other moving or stationary objects is called relative velocity.

The correct option is 2.