If the density of the mattress is 1000 kg/m³. Then the mass of the mattress will be 4800 kg.
Density is defined as the mass per unit volume. It is an important parameter in order to understand the fluid and its properties. Its unit is kg/m³.
The mass and density relation is given as
mass = density × volume
The mattress of a water bed is 4.00 m long by 4.00 m wide and 30.0 cm deep. And the density of the mattress is 1000 kg/m³.
Then the mass of the mattress will be
M = 1000 x 4 x 4 x 0.3
M = 4800 kg
To learn more about the density refer to the link;
brainly.com/question/952755
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