Two bodies are moving in the opposite direction with velocity V. The relative velocity is

2V.

To find the relative velocity, we need to subtract the velocity of one body from the velocity of the other. Since the bodies are moving in opposite directions, we can consider the velocities to have opposite signs.

Let's assume the velocity of one body is +V and the velocity of the other body is -V. The relative velocity is then calculated as follows:

Relative velocity = velocity of body 2 - velocity of body 1
= (-V) - (+V)
= -V - V
= -2V

Therefore, the relative velocity of the two bodies moving in opposite directions with velocity V is -2V.