Relative velocity between two bodies is the measure of how fast one body is moving with respect to another body. It takes into account the motion of both bodies and can be calculated in terms of speed and direction.
Absolute velocity is the measure of how fast a body is moving in relation to a fixed point or reference frame, whereas relative velocity takes into account the motion of both bodies in relation to each other.
Relative velocity is calculated by subtracting the velocity of one body from the velocity of the other body. This can be done using vector addition, taking into account the direction of motion.
The relative velocity between two bodies can be affected by factors such as the initial velocities of the bodies, the direction of motion, and any external forces acting on the bodies.
Relative velocity is important in physics because it helps us understand the motion of objects in relation to one another. It is also used in many real-life applications, such as navigation, astronomy, and engineering.