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  3. 9th Class
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9th Class Science Work and energy Question Bank Work Power and Energy Summative Objective Problems

  • question_answer
    A person of mass 50 kg climbs a tower of height 72 metre. The work done is [\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\]]

    A)  35280 J                

    B)  32580 J

    C)  52380 J                                

    D)  58320 J

    Correct Answer: A

    Solution :

      \[m=50\,\,kg,\,\,h=72m,\,\,g=9.8\,\,m/{{s}^{2}}\] \[W=F\times S=mg\times h=50\times 9.8\times 72\,\,J=35280\,\,J\]      


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