1. The problem statement, all variables and given/known data m1= 0,05 kg, m2= 0,03 kg, mass of spring is omitted. We look at movement after spring stopped vibrate. How long does the spring measure during the movement if not stretched spring measure 0,1 meter and if we use force 0,1N elongation measures 0,02 meter. (sorry, English isn't my main language, I've never learn scientific words so I'm not quite sure if my translation is right) I know the answer is 0,174 meter. 2. Relevant equations 3. The attempt at a solution m1*a = m1*g - Ft (Ft is thread tension) m2*a = Ft + Fs - m2*g 0,1 = k*0,02 k=5 Don't know what next and if it's even right.