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J & K CET Engineering J and K - CET Engineering Solved Paper-2011

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

    A)  \[1960\text{ }J\]           

    B)  \[196\text{ }J\]

    C)  \[1.96\text{ }J\]          

    D)  \[196\text{ }kJ\]

    Correct Answer: A

    Solution :

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


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