You need to build a spring scale for weighing (actually building it is not necessary, this is theoretical exercise.) It will be helpful to sketch out a design. You need a scale capable of weighing objects up to 10 kg. The spring constant is k = 3.50 N / cm. A ruler with marks every mm will be used to measure the displacement.

a) how will you convert displacement to mass?

b) what is the resolution of the scale?