There are 3 significant figures, if that answers the question.
The basketball has the greatest gravitational potential energy at its, highest which is at the very top.
Place the object in an electronic balance and measure its mass.
Place a measured amount of water in the cylinder.
Place the object in the cylinder so that it’s fully submerged.
Measure the new level of the liquid and subtract the original level. This is equal to the volume of the object.
Density = mass / volume.
