Uses Hooke's Law to solve this problem. If a force of N stretches a spring m beyond its natural length, how much work does it take to stretch the spring m beyond its natural length?

Work done = 1/2 × Ne

Explanation:

Given that if  a force of N stretches a spring m beyond its natural length, how much work does it take to stretch the spring m beyond its natural length

Using Hook's law

Force = N

Let the extension = e

Work done in stretching spring m beyond its natural length will be

Workdone = 1/2 × Ne

Or

From Hook law,

N = Ke

Work done = 1/2 × Ke^2

d) physical means can be used to separate the components of air.