Explain relative velocity.

Relative velocity is the velocity of an object with respect to another object or frame of reference.

Relative velocity is the velocity of an object with respect to another object or frame of reference. It is the difference between the velocities of the two objects. For example, if a car is moving at 50 km/h and a person is walking at 5 km/h in the same direction as the car, the relative velocity of the person with respect to the car is 45 km/h. If the person is walking in the opposite direction to the car, the relative velocity of the person with respect to the car is 55 km/h.

Relative velocity can be calculated using vector addition. If two objects A and B are moving in different directions with velocities vA and vB respectively, the relative velocity of A with respect to B is given by vAB = vA - vB. If the two objects are moving in the same direction, the relative velocity is the difference between their velocities. If they are moving in opposite directions, the relative velocity is the sum of their velocities.

Relative velocity is an important concept in physics and is used to describe the motion of objects in different frames of reference. It is also used in navigation, where the velocity of an object with respect to the ground is important for determining its position and direction.