Question: I got this question wrong on a test and do not understand why. An ideal spring has a spring constant (force constant) of 2500 N/m.

I got this question wrong on a test and do not understand why.

An ideal spring has a spring constant (force constant) of 2500 N/m. is stretched 4.0 cm. How much Elastic Potential Energy would it have?

I selected 3.0 J.

My teacher says it is 2.0 J.

Can you explain why?

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