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A porter carries 80 kg mass on his head....

A porter carries 80 kg mass on his head. As he reaches the destination, he keeps the load down by moving a distance 80 cm from his head to ground. The work done by partner is(assume the load to be moved slowly)

A

734 J

B

-6272 J

C

672.2 J

D

-627.2 J

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