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I have the following homework problem:

"A 200-g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200-gmass is added to the spring, the potential energy of the spring will be"

I know the answer is 4 times as much but I am not quite sure how the answer is being reached.

I thought I could use the forumla:

U= 1/2 kx^2

But I am wrong.

Any help would be much appreciated!

Thank you!!!

A.

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# Homework Help: Potential Energy of a Spring

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