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What's the potential energy?

A force of 10 N stretches a spring that has a spring constant of 20 N/m. What's the potential energy stored in the spring?
 
Answer: 2.5 J
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1 Answer

F = kx => 10 = 20x => x = 1/2
Ep = (1/2)kx^2 = (1/2)(20)(1/2)^2 = 2.5 J  <==Answer
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Attn: Here I just used absolute values for all variables.