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

  • question_answer
    A ball of mass \[1\,\,kg\] thrown upwards reaches a maximum height of\[5\,\,m\]. Calculate the work done by the force of gravity during this vertical displacement.

    A) \[-30\,\,J\]         

    B)        \[-48\,\,J\]

    C) \[-49\,\,J\]           

    D)        \[-59\,\,J\]

    Correct Answer: C

    Solution :

     \[W=F\,\,S\cos \theta =mg\,\,S\,\,\cos \theta \] (\[\theta ={{180}^{o}}\]since \[F\] and \['S'\] are in the opposite directions)


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