Spring stiffness

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A spring has stiffness of 100Nmm, the initial compression of the spring is 15mm, and it is then compressed to 65mm.
a)Find potential energy at 15mm:
K=100Nmm*1000=100000Nm
Ep=Kc^2/2
Ep=(100000*0.015^2)/2
Ep=11.25 joule (ans.)
b)Find Ep at 65mm:
Ep2=(100000*0.065^2)/2
Ep2=211.25 joule(ans.)
c)Find the work done during compression:
W.D.=Ep2-Ep1
W.D.=211.25J-11.25J
W.D.=200Joule

  • Physics? -

    assistance needed

    Please type your subject in the School Subject box. Any other words are likely to delay responses from a teacher who knows that subject well.

  • Spring stiffness -

    I agree with your numbers.

  • Spring stiffness -

    Thanks drwls... could you check the next one please

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