A raft is constructed of wood having a density of 576 kg/m³. The raft is 2.25 m long and 1.50 m wide, and is 0.25 m tall. The density of water is 984 kg/m³. When this raft is placed in water, to what depth h is the bottom of the raft submerged, in meters? How much mass, in kg, could be loaded on the raft before it would sink?