Use Archimedes' principle to explain why.If an inflated beach ball is placed beneath the surface of a pool of water and released, it shoots upward,...

Archimedes' principle states that an object placed in a liquid experiences a buoyant force equal to the weight of liquid it displaces. This force pushes the object upward towards the surface of the liquid.

An inflated beach ball completely immersed in pool of water will displace water equal to the volume of the beach ball. Therefor according to Archimedes' principle it is clear that the beach ball will experience a buoyant force equal to the weight of water equal to the weight of water equal to volume of ball. This force is much more than the weight of the ball. Thus the ball can be kept immerses in water only by some devise holding it down. Bus as soon as the ball is released it will be pushed out of water under the influence of the buoyant force less weight of the ball. As the ball moves up to the surface of the pool its velocity will increase, and as it emerges out of water, it will continue to move upward in air because of kinetic energy of the velocity it has acquired. Once our of water there is no buoyancy force acting on the ball that pushes it upwards. Rather there is gravitational force that pulls the ball down. Under the influence of this gravitational pull the ball will slow down as it rises above the water surface till its velocity becomes zero. At this point the ball is at its highest point. After this the ball will begin to fall down.