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

  • question_answer
    The rectangular components of a force are applied to move a body. One of the components is\[30\,\,N\]. What should be the other component to obtain a resultant force of\[50\,\,N\]?

    A) \[30\,\,N\]         

    B)        \[40\,\,N\]  

    C) \[50\,\,N\]         

    D)        \[90\,\,N\]

    Correct Answer: B

    Solution :

     Let the unknown component be\['x'\]. \[\therefore \]\[{{50}^{2}}={{30}^{2}}+{{x}^{2}}\]             \[{{x}^{2}}=2500-900,\,\,{{x}^{2}}=1600\]             \[x=\sqrt{1600},\,\,x=40\,\,N\]


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