A rectangular block of width = 5 m, height = 3 m and length = 10 m (into the plane of the paper) is floating in a liquid of density 1500 kg/m3. If the centre of buoyancy is located at a vertical distance of 2.5 metres from the top edge of the block, then the density of the material making up the block is:
1
1500 kg/m3
2
500 kg/m3
3
750 kg/m3
4
700 kg/m3