1. The question about why two objects need to go in opposite directions usually arises in problems involving relative motion or forces. 2. Even if the problem does not explicitly state directions, opposite directions are often assumed to analyze the situation clearly, especially when dealing with velocities or forces acting on two objects. 3. For example, if two objects move away from each other, their velocities are in opposite directions, which affects calculations like relative speed or momentum. 4. Without direction information, we assign opposite directions to simplify the problem and apply vector principles correctly. 5. This assumption helps in solving problems consistently and understanding the physical scenario better. 6. If the problem provides no direction, you can choose a direction as positive and the opposite as negative to proceed with calculations.