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:

When two entities are moving in opposite directions, we subtract their relevant values (such as velocities, forces etc.) to find the net - effect or relative value. For example, if one object is moving with a velocity of \(v_1\) to the right and another with velocity \(v_2\) to the left, the relative velocity is \(v_1-(-v_2)=v_1 + v_2\) in terms of magnitude calculation considering directions.

Answer:

They are going in opposite directions.