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**fattydq** Suppose that 3 J of work is needed to stretch a spring from its natural length of 26 cm to a length of 42 cm.

(a) How much work W in joules, is needed to stretch the spring from 36 cm to 44 cm?

(b) How far beyond its natural length will a force of 40 N keep the spring stretched? (Round the answer to the nearest tenth.)

Ok so work is force times distance, so I can assume that 3=16d and that the force is 3/16

So then I try 8 times 3/16 which gives me 1.5,b ut that's incorrect. So what am I doing wrong?

And then for b, I have no idea how to even solve it backwards like that. Could someone point me in the right direction?