A cylinderical wooden block of cross-section 15.0 `cm^(2)` and mass 230g is floated over water with an extra weight of 50 g attached to its bottom. The cylider floats vertically. From the state of equilibrium, it is slightly depressed and released. If the specific gravity of wood is 0.30 and `g=9.8ms^(-2)` deduce the frequency of the block, `A=15.0cm^(2)=15xx10^(-4)m^(2)`