Question

When will the relative velocity of two moving objects is zero?

Answer 1

• When the two bodies move in the same direction

• with equal magnitude of velocity... then the relative velocity is zero

• As we know, all motion and so also velocity is relative, and has no meaning without a reference frame.

• So if the reference point/ frame is moving at the same velocity as the object (wrt a third frame of reference), the object has zero velocity wrt the reference point.

• Take two persons sitting in a car.
• While the car is moving on the road, the persons inside are stationary wrt each other (zero velocity wrt each other).
• The fact that they are moving together with the car on road is immaterial for the persons.