1. The problem statement, all variables and given/known data A mass of 50.0 g mass is hung from a spring, spring is elongated to 40 cm, an additional mass of 20g is added, with a new reading of 45cm a) what is the spring constant for this spring? b) another mass of 30g is added to the spring, what is the new reading? 2. Relevant equations k= mg/x 3. The attempt at a solution not sure if this is the right approach a) k= change in mass x g / change in height 0.020x9.8/0.05 =3.92n/m b)mg=kx 0.03x9.8=3.92x x=0.075 so it extend another 7.5cm?