If a certain spring is stretched 2 m and produces a force of 10 N, set up an integral to find the amount of work done in stretching the spring an additional 3 m.
a) ∫₂^5 10 dx
b) ∫₂^5 1/x dx
c) ∫₂^5 10x dx
d) ∫₂^5 10/x dx