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# Stuck at Mechanics 2 ** question!!! "A spring is stretched to a length 0.6m..." Watch

1. I am currently stuck at a star (*) question, which is the last of the chapter. It is as follows:

"A spring is stretched to a length 0.6m
The work done in stretching it from this length to a length of 0.8m is 2 J.
The modulus of elasticity of the spring is 10 N.
Find its natural length."
#*

Also given here:

http://www.smpmaths.org.uk/AQA_mech2_cont_samp.pdf

on page 120 #10

Help is greatly appreciated.
2. (Original post by llpokermuffinll)
I am currently stuck at a star (*) question, which is the last of the chapter. It is as follows:

"A spring is stretched to a length 0.6m
The work done in stretching it from this length to a length of 0.8m is 2 J.
The modulus of elasticity of the spring is 10 N.
Find its natural length."
#*

Also given here:

http://www.smpmaths.org.uk/AQA_mech2_cont_samp.pdf

on page 120 #10

Help is greatly appreciated.
In what way are you stuck? How far have you got?
3. (Original post by ghostwalker)
In what way are you stuck? How far have you got?
Completely stuck. I mean if you look in the link, I was able to do number 1 - 9 easily, but at 10 I simply don't know in what way to do it? It would helpful to know in what way to solve the problem.
4. (Original post by llpokermuffinll)
Completely stuck. I mean if you look in the link, I was able to do number 1 - 9 easily, but at 10 I simply don't know in what way to do it? It would helpful to know in what way to solve the problem.
Since you're given the energy in stretching from .6 to .8 m, I'd start by forumulating an equation based on that.

2 = "energy to stretch to .8 m" - "energy to stretch to 0.6 m".

Try to just use the natural length of the spring as the only unknown.

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