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    Question

    A porter lifts luggage of 20 kg from the ground and puts

    it on his head 2 m above the ground. Calculate the work done by him on the luggage (take g = 10ms-2)
    A 400 J Correct Answer Incorrect Answer
    B 200 J Correct Answer Incorrect Answer
    C 350 J Correct Answer Incorrect Answer
    D 150 J Correct Answer Incorrect Answer

    Solution

    Mass of the luggage (m)= 20 kg ⇒ Height above the ground (h) = 2m So, the work done by porter on luggage is ⇒ P.E = mgh = (20)×(10)×(2) = 400 J

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