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# Jennifer lifts a 2.5 -kg carton of cat litter from the floor to a height of $0.75 \mathrm{m} .$ (a) How much total work is done on the carton during this operation? Jennifer then pours $1.2 \mathrm{kg}$ of the litter into the cat's litter box on the floor. (b) How much work is done by gravity on the $1.2 \mathrm{kg}$ of litter as it falls into the litter box?

## (a) $18 \text{ J}$ (b) $8.8 \text{ J}$

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##### Andy C.

University of Michigan - Ann Arbor

##### Marshall S.

University of Washington

##### Jared E.

University of Winnipeg

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