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    (Original post by LorryBalls)

    what paper is this?
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    I got 0.3 J but I don't know if its right

    I found the extension by using the formula f=kx solving for x
    x= 0.2

    then i used e= 1/2kx^2

    e = 1/2*15*02 = 0.3 J
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    Yes, that's the correct answer. See the marking scheme at http://filestore.aqa.org.uk/resource...-74072-SMS.PDF (last page).
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    I got A - 0.3J but i did it slightly differently to hellomynameisr

    On the formula sheet E = 1/2 * F * extension
    and
    F = k * extension

    so by subbing in:

    E = 1/2 * F2 /k

    so 1/2 * 32 / 15 = 0.3
 
 
 
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