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

  • question_answer
    Work done in moving a 50 kg block through a horizontal distance of 10 m by applying a force of 100N which makes an angle of \[60{}^\circ \] with the horizontal is

    A)  200 joules       

    B)         425 joules

    C)  500 joules          

    D)         575 joules

    Correct Answer: C

    Solution :

                    \[W=F\times s\times \cos \theta \]                     \[=100\times 10\times cos{{60}^{o}}\]                     \[=1000\times \frac{1}{2}=\mathbf{500}\,\,\mathbf{joules}\]


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