Question

Two cars A and B are moving with velocities of 100 km/hr and 60 km/hr. What is the relative velocity of car A with respect to car B, if both are moving along same straight line in same direction?​

Answer 1

Explanation:

Vab=Va-Vb=100-60=40km/hr

Answer 2

Given:

Two cars A and B moving in the same direction with velocities of 100km/h and 60km/h respectively.

To Find:

The relative velocity of A with respect to B.

Solution:

The relative velocity of an object A with respect to B is the velocity of A assuming B as the frame of reference.

It can be found using the relation

   $v_{AB}=v_A-v_B$

where $v_A$ is the velocity of A with respect to the earth and $v_B$ is the velocity of B with respect to the earth.

⇒ $v_{AB}=100-60=40km/h$

Hence, the relative velocity of A with respect to B is equal to 40km/h.