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

Option 1 -

-627.2J

Option 2 -

-62720.0 J

Option 3 -

627.2 J

Option 4 -

784.0 J

0 3 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    a month ago
    Correct Option - 1


    Detailed Solution:

    W = mgh

          

    = 8 0 × 9 . 8 × ( 8 0 1 0 0 )

    = 6 2 7 . 2 J

    ⇒ w f + w g = 0 ⇒ w f = − 6 2 7 . 2 J  

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