Final answer:
The weight of the waterbed is 1200 kg.
Step-by-step explanation:
To find the weight of the waterbed, we need to calculate the volume of water it displaces. The volume of a rectangular prism is given by multiplying its length, width, and height. In this case, the volume of the waterbed is 2m x 2m x 0.3m = 1.2 cubic meters.
Since water has a density of 1000 kg/m³, we can calculate the weight by multiplying the volume by the density: weight = volume x density = 1.2m³ x 1000kg/m³ = 1200kg.
Therefore, the weight of the waterbed is 1200 kg.