Posted by **Henri** on Tuesday, April 21, 2009 at 6:40pm.

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

Hope this is correct, thank you for checking my work

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