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

  • question_answer
    A cat of mass 8 kg is running after a rat with a uniform acceleration of 1m/sec2. After running 40 m it gets success to catch the rat. The work done by the cat in the process is

    A) 320 J        

    B) 640 J

    C) 5 J                              

    D) 10 J

    Correct Answer: A

    Solution :

        Since, \[\text{W=F}\times \text{d and }F=ma\]                         \[W=ma\times d\]                             \[=8\times 1\times 40\]                         \[W=320\text{J}\]                  


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