**Explanation:**

The coefficient of restitution (COR) is a parameter used to measure the elasticity of a collision between two bodies. It is defined as the ratio of the relative velocity of separation to the relative velocity of approach between the two bodies after a collision. In other words, it represents the fraction of kinetic energy lost or retained during a collision.

For inelastic bodies, the coefficient of restitution is zero. This means that there is no rebound or separation between the bodies after a collision. In an inelastic collision, the two bodies stick together and move as a single mass after the collision.

**Reasoning:**

In an inelastic collision, the kinetic energy is not conserved. The kinetic energy before the collision is greater than the kinetic energy after the collision. This loss of kinetic energy is due to the internal forces and deformation of the bodies involved in the collision.

When the coefficient of restitution is zero, it means that the relative velocity of separation is zero. This implies that the bodies do not separate or rebound after the collision. The final velocity of both bodies is the same, and they move together as a single mass.

**Examples:**

- A car colliding with a wall and coming to a complete stop is an example of an inelastic collision. The car and the wall stick together after the collision, and there is no rebound or separation.
- When a ball is dropped and it collides with the ground, it loses kinetic energy and comes to rest. The ball and the ground stick together momentarily before the ball bounces back up.

**Conclusion:**

In summary, the coefficient of restitution for inelastic bodies is zero because there is no rebound or separation after a collision. The bodies stick together and move as a single mass.