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  5. Work and energy

9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    Find the work done by a student in lifting a \[0.5\,\,kg\] book from the ground and keeping it on a shelf of height\[1.5\,\,m\]

    A) \[8.30\,\,J\]       

    B)        \[7.35\,\,J\]  

    C) \[5.40\,\,J\]                   

    D) \[0.1\,\,J\]

    Correct Answer: B

    Solution :

    \[W=P.E.=mgh=0.5\times 9.8\times 1.5\]         \[=4.9\times 1.5=7.35\,\,J\]


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