1. The problem statement, all variables and given/known data A girl with mass m kg steps into her inflatable ring with horizontal cross sectional area Am^2 and jumps into the pool. After the first splash, what is the frequency of the girl bobbing up and down? 2. Relevant equations I assume that we need the extra force,F_e, after the buoyant force and the weight cancel. Archimedes F_b = mg We can then use Newton 2, F=ma, where a=x". x" = sqrt(F_e/m) f=1/[2π√(F_e/m)] 3. The attempt at a solution The above ω will be for the frequency. I am not sure if the above is right and I do not know how to solve for the F_e Thanks!