Verified Answer :

D=m/v
D=[40÷1000]÷[20÷1000]
D=2kg per m³

The density of a 40 gram object with a volume of 20 milliliters is 2kg/L.

To calculate the density of an object, the following relationship between its mass and its volume is needed:

                                                      \(d = \frac{m}{v}\)

In order to adapt to the norms of the international system, it is necessary to change the value of the unit of mass to kilograms and of volume to liters:

                                         

  •   Mass

                                                    \(1 g = 10^{-3}kg\)

                                                \(40 g = 40 \times 10^{-3} kg\)

  • Volume

                                               \(1 mL = 10^{-3}L\)

                                           \(20 mL = 20\times 10^{-3}L\)

Now, just apply the values ​​in the given density formula:

                                             \(d = \frac{40\times10^{-3}}{20\times10^{-3}}\)

                                              \(d = 2kg/L\)

So, The density of a 40 gram object with a volume of 20 milliliters is 2kg/L.

Learn more about density in: brainly.com/question/952755