What is the acceleration of a 0.50 kilogram ball that hit with a force of 21.5

43m/s^2

It's derived from the equation F=ma.

Assuming that the force is in SI units which is Newtons, the answer is as such. The working is attached

btw,next time put all the units down when asking

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.