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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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Knowledge Check

  • A man carries a load on his head through a distance of 5 m. The maximum amount of work is done when he

    A
    Moves it over an inclined plane
    B
    Moves it over a horizontal surface
    C
    Lifts it vertically upwards
    D
    None of these

  • A porter lifts a suitcase weighing 20 kg from the platform and puts it on his head 2 m above the platform. The work done by the porter on the suitcase is

    A
    400J
    B
    500J
    C
    600J
    D
    800J

  • A man carries a load of 5 kg on his head through a distance of 10 m. the minimum amount of work is done when he

    A
    Move it up an inclined plane
    B
    Moves it down an inclined plane
    C
    Moves it over a horizontal surface
    D
    Lifts it vertically upwards.

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