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

  • question_answer
    A block of mass \[1\,\,kg\] slides down on an inclined plane with the angle of inclination of\[{{30}^{o}}\]. Find the work done as the block slides through\[50\,\,cm\].

    A) \[3.45\,\,J\]       

    B)        \[5.30\,\,J\]

    C) \[2.45\,\,J\]         

    D)        \[4.50\,\,J\]

    Correct Answer: C

    Solution :

     \[W=F\,\,S=mg\,\,\sin \theta \times S\]            \[=1\times 9.8\times \sin 30\times 0.5=2.45\,\,J\]


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