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A porter lifts a heavy suitcase of mass ...

A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity . Calculate the workdone by the porter in lowering the suitcase
(take `g = 9.8 ms^(-2)` )

A

`- 62 720 .0 J`

B

`-627.2 J`

C

`+627.2 J`

D

`784.0J`

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