Understanding Buoyant Force

* Archimedes' Principle: The buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

* Weight of Displaced Fluid: The weight of the displaced fluid is directly proportional to the volume of fluid displaced.

Applying the Concepts

1. Weight of Displaced Water: You're given that the object displaces 15N of water. This means the weight of the water displaced is 15N.

2. Buoyant Force: According to Archimedes' Principle, the buoyant force on the object is equal to the weight of the water displaced. Therefore, the buoyant force is 15N.

Important Note: The weight of the object (20N) is not directly needed to calculate the buoyant force. The buoyant force depends only on the weight of the fluid displaced.