A force of 2N stretches an elastic material by 0.03m. What additional force will stretch the material by 0.03. Assume that the elastic limit is not exceeded.

Answer 1

F = k x
twice as far requires twice the force

Answer 2

2/0.03 = x/(0.03+0.03)
X = 4N.
4-2 = 2N. added.