posted by Henri .
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:
Ep=11.25 joule (ans.)
b)Find Ep at 65mm:
c)Find the work done during compression:
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I agree with your numbers.
Thanks drwls... could you check the next one please