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  3. 9th Class
  4. Science
  5. Work and energy

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

  • question_answer
    A pen is dropped from a height H. When it reaches the ground, its velocity is\[50\text{ }m/s\]. The value of H is\[\left( g=9.8\,m/{{s}^{2}} \right)\]:

    A) 55 m                

    B) 127.5 m

    C) 105 m  

    D)        120 m

    E) None of these

    Correct Answer: B

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