A raft of wood (density 600 kh/m 3 ) of mass 129 kg floats in water. How much weight can be put on the raft to make it just sink ?

Volume of the raft =(129/600)=0⋅215m3 Weight of water displaced when it sinks =0. 215 ×103 ×9.8 N = 2107 N   Hence additional weight to be placed =( 2107 - 129×9.8 ) N= 842.8 N.Hence additional mass to be placed = 842.89.8kg =86 kg