Final answer:
The density of the hammer is calculated by dividing its mass (16 g) by its volume (4 cm³), resulting in a density of 4 g/cm³.
Step-by-step explanation:
The density of a hammer can be found by dividing its mass by its volume. If the mass of the hammer is 16 g and the volume is 4 cm³ (note that volume should be in cubic centimeters, not square centimeters), the density (D) is calculated using the equation D = m/V, where m is the mass and V is the volume.
In this example, D = 16 g / 4 cm³ = 4 g/cm³. Therefore, the density of the hammer is 4 grams per cubic centimeter.