Here's why:

* Like charges repel: The fundamental rule of electrostatics is that objects with the same charge will push away from each other.

* Electrostatic Force: The force of repulsion between two positively charged objects is governed by Coulomb's Law. This law states that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

In simpler terms: Imagine two magnets with the same poles facing each other (north-north or south-south). They would push away, just like two positively charged objects would.