The rapid movement of a particle, elastic solid, or surface across a central position is called a it has something to do with sound

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.

the answer is b ) square root of 5

not too sure thinking all accelerations are pointed down