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A 1.70 kg ball is attached to a ceiling by a 1.15 m long string. The height of the room is 3.00 m. What is the gravitational potential energy of the ball relative to the ceiling and floor?

I'm having trouble finding the displacement. I know that its going to be mass x gravity x displacement... so thats 1.70 x 9.8 x displacement... i thought it was 3-1.15 but that didnt work

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# GPE and a ball

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