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JCECE Medical JCECE Medical Solved Paper-2014

  • question_answer
    A gardener pushes a lawn roller through a distance 20 m. If he applies a force of 20 kg-wt in a direction inclined at \[{{60}^{o}}\] to the ground, the work done by him is

    A)  1960J

    B)  196J

    C)  1.96 J

    D)  196kJ

    Correct Answer: A

    Solution :

     \[F=20\text{ }kg-wt=20\times 9.8\text{ }N\] \[\theta ={{60}^{o}}\]and \[s=20\,m\] Work done \[=Fs\cos \theta \] \[=20\times 9.8\times 20\times \cos {{60}^{o}}\] \[=1960\,J\]


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