Why does a buoyant force act on every object in a fluid

Well when an object floats, a force pushes up on the object. The force then acts against the downward force of gravity. Which is called the buoyant force.( 8.8.c) The buoyant force on an object in a fluid is an upward force equal to the weight of the fluid the object has displaced.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.