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9th Class Science Work and energy Question Bank Work Power and Energy Formative Objective Problems

  • question_answer
    A body moves a distance of 10 m along a straight line under the action of a force of 5N. If the work done is 25J, then the angle which the force makes with the direction of motion of the body is

    A)  \[0{}^\circ \]                     

    B)  \[\text{3}0{}^\circ \]  

    C)  \[\text{6}0{}^\circ \]     

    D)  \[\text{9}0{}^\circ \]

    Correct Answer: C

    Solution :

        \[S=10\,m\] \[F=5\,N\] \[W=25\,J\] \[\theta =?\] \[W=FS\,\cos \theta \] \[25=5\times 10\times \,\,\cos \theta \] \[\frac{1}{2}=\cos \theta \] \[\theta =60{}^\circ \]   


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