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I would probably use kilograms.
"Kilogram" is not a unit of weight. It's reasonable to expect that a cat might have a mass of four kilograms.
The mass of an average cat (male) is around 5 kilograms = 5,000 grams
pounds
PE = (force) x (distance) = (weight) x (height) = (mass x gravity) x (height) =(4 x 9.8) x (3) = 117.6 joules with respect to the floor.