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BCECE Medical BCECE Medical Solved Papers-2009

  • question_answer
    From the top of a building 40 m tall, a boy projects a stone vertically upwards with an initial velocity 10 \[m{{s}^{-1}}\] such that it eventually falls to the ground. After how long will the stone strike the ground? Take \[g=10\,\,m{{s}^{-2}}\]

    A)  1 s              

    B)  2 s

    C)  3 s               

    D)  4 s

    Correct Answer: D

    Solution :

    \[S=ut+\frac{1}{2}g{{t}^{2}}\] or            \[40=-10\,t+\frac{10}{2}\,{{t}^{2}}\] or            \[{{t}^{2}}-2\,t-8=0\] or            \[(t+2)\,\,(t-4)=0\] \[\Rightarrow \] t = 4 s as t cant be negative.


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