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  3. 9th Class
  4. Science
  5. Gravitation and Floatation

9th Class Science Gravitation and Floatation Question Bank Gravitation IIT JEE Objective Problems

  • question_answer
    A body let fall from the top of a building reaches the ground in 3 s. Height of the building is

    A)  14.7 m                 

    B)  24.4 m

    C)  44.1 m

    D)  66.2 m

    Correct Answer: C

    Solution :

      \[h=\frac{1}{2}g{{t}^{2}}=\frac{1}{2}\times 9.8\times 9=44.1\,m\] since initial velocity is equal to zero.       


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