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I dont know what I am doing wrong for the V2kin part.  I know from class that the gravity has to be 981 instead of 9.81 because the chart is in cm but that is as far as I have gotten.  I have tried distance times the square root of gravity divided by 2H^2. And the square root of 2 time gravity times H^2 but both were wrong. Please help!!image.png

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