7th Class Science Related to Competitive Exam Question Bank Work and energy

  • question_answer
    Same amount of work has to be done on two objects A and B of same mass by applying force of 8 N and 16 N respectively. Then A will displace

    A) more than object B     

    B) less than object B

    C) Same as B                  

    D) Cannot say

    Correct Answer: A

    Solution :

         \[W=F.d\] For object A \[{{W}_{A}}=8\times {{d}_{A}}\] For object B \[{{W}_{B}}=16\times {{d}_{B}}\] Since, \[{{W}_{A}}={{W}_{B}}\] \[\therefore \] \[8\times {{d}_{A}}=16\times {{d}_{B}}\] \[\Rightarrow \]\[{{d}_{A}}=\frac{16}{8}\times {{d}_{B}}\] \[\therefore \] \[{{d}_{A}}=2{{d}_{B}}\] \[i.e.\]


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