# As level physics spring energy question

60J of work is done to stretch a spring with spring constant 7.5Ncm
−1
from its natural length of 0.24m to some new length. Work out this new length.

I have used the formula, 1/2kx^2 and I get 0.28m as my final answer.
I have made sure to convert the force constant (750n/m) but my answer is still apparently wrong.
Any help?
Original post by Tahym
60J of work is done to stretch a spring with spring constant 7.5Ncm
−1
from its natural length of 0.24m to some new length. Work out this new length.

I have used the formula, 1/2kx^2 and I get 0.28m as my final answer.
I have made sure to convert the force constant (750n/m) but my answer is still apparently wrong.
Any help?

did you forget the 1/2 / interpret the x as being the extension correctly?
(edited 2 months ago)
Original post by Tahym
60J of work is done to stretch a spring with spring constant 7.5Ncm
−1
from its natural length of 0.24m to some new length. Work out this new length.

I have used the formula, 1/2kx^2 and I get 0.28m as my final answer.
I have made sure to convert the force constant (750n/m) but my answer is still apparently wrong.
Any help?

Did you make an arithmetic error?
It would be good to show your working.

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