1. The problem statement, all variables and given/known data A fisherman's scale stretches 3.4 cm when a 3.3 kg fish hangs from it. (a) What is the spring constant? (b) What will be the amplitude and frequency of vibration if the fish is pulled down 2.5 cm more and released so that it vibrates up and down? 2. Relevant equations I know that the PE of a spring is .5kA I also know that x=Asinwt But I don't know t, so I can't see how I'd use that equation either. 3. The attempt at a solution I know that equation, but how can I set it equal to the KE of the spring when I don't know the velocity of the spring at all?? I thought this might be a conservation of energy problem but I don't see how that would work out.