To calculate the density of a cube, you can use the formula:
\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]
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Calculate the volume of the cube: The volume \( V \) of a cube is given by the formula:
\[ V = \text{side length}^3 \]
For a cube with a side length of 2 meters:
\[ V = 2^3 = 8 , \text{m}^3 \]
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Use the mass given: The mass \( m \) of the cube is 40 kg.
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Calculate the density:
\[ \text{Density} = \frac{40 , \text{kg}}{8 , \text{m}^3} = 5 , \text{kg/m}^3 \]
Thus, the density of the cube is \( 5 , \text{kg/m}^3 \).