1. Mathematically, relative means starting from A and B and driving back to the center. So, we got closer and closer until we met.

Mathematically, face-to-face means starting from the same place and driving in the opposite direction, and the result is farther and farther.

Extended data:

First, the two meanings of opposing movement.

1, relative motion

Two moving objects in opposite directions are close to each other and finally intersect in the middle, so they belong to relative motion.

2, the opposite movement

Two objects in opposite directions move away from each other, and eventually the distance between them will continue to widen, so they move in opposite directions.

Second, the relationship between relative motion and opposite motion.

Opposition movement includes two ways: opposition and opposition. Relative motion is a way of opposite motion, and the two will intersect at a certain point on the same straight line. Anti-motion is another way of anti-motion. Two opposite movements will never intersect, and the distance between them will get bigger and bigger.