Question

why do we subtract in this example?
theyre are equal.
they are both moving in the same direction.
they are going in opposite directions.
they are unbalanced.

Explanation:

In physics, when two vectors (such as velocities or forces) are in opposite directions, we subtract their magnitudes to find the net - effect. For example, if one force is acting to the right and another of a different magnitude is acting to the left, we subtract to find the overall force acting on an object.

Answer:

They are going in opposite directions.