A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a a distance

Описание к видео A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a a distance

A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a a distance of 80 cm with a constant velocity. Calculate the work done by the porter in lowering the suitcase. (take g=9.8 ms-2)
[July 22, 2021 (I)]
(a) -62720.0 J (b) -627.2 J
(c) +627.2 J (d) 784.0 J

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