2. Questions Bank
  3. 9th Class
  4. Science
  5. Work and energy

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

  • question_answer
    Find the work done by a force of \[5\,\,N\] in displacing a book through \[20\,\,cm\] along the direction of the push.

    A) \[1J\]                              

    B) \[3J\]

    C) \[4J\]                

    D)        \[5J\]

    Correct Answer: A

    Solution :

     \[W=5\times 0.2\times \cos {{0}^{o}}=1\,\,J\] (\[\theta =0\]since \['F'\] and \['S'\] are in the same direction).


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