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9th Class Science Gravitation and Floatation Question Bank Gravitation and Pressure

  • question_answer
    A stone is thrown vertically upwards with an initial velocity of\[14\,\,m\,\,{{s}^{-1}}\]. Find the time taken by the stone to strike the ground. (Take\[g=9.8\,\,m\,\,{{s}^{-2}}\])

    A) \[2.86\,\,s\]                      

    B) \[3.46\,\,s\]

    C) \[3.86\,\,s\]        

    D)        \[4.86\,\,s\]

    Correct Answer: A

    Solution :

     \[u=14\,\,m\,\,{{s}^{-1}};\,\,g=9.8\,\,m\,\,{{s}^{-2}}\]. \[t=\frac{2u}{g}=\frac{2\times 14}{9.8}=2.86\,\,s\]


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