If the density of the mattress is 1000 kg/m³. Then the mass of the mattress will be 4800 kg.
<h3>What is density?</h3>
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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