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## Homework Statement

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?

## Homework Equations

k= mg/x

## 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?