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J & K CET Medical J & K - CET Medical Solved Paper-2011

  • question_answer
    A gardener pushes a lawn roller through a distance 20 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 J                                  

    B)  196 J

    C)                  1.96 J                                   

    D)  196 k J

    Correct Answer: A

    Solution :

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


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