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NTSE Sample Paper NTSE SAT Practice Test-19

  • question_answer
    A stone thrown upward with a speed u from the top of the tower reaches the ground with a velocity 3 u. The height of the tower is

    A) \[\frac{3{{u}^{2}}}{g}\]                                 

    B) \[\frac{4{{u}^{2}}}{g}\]

    C) \[\frac{6{{u}^{2}}}{g}\]                     

    D) \[\frac{9{{u}^{2}}}{g}\]

    Correct Answer: B

    Solution :

    [b] \[{{v}^{2}}-{{u}^{2}}=2a\,\,S\] or \[{{\left( 3u \right)}^{2}}-{{u}^{2}}=2\left( -g \right)H\] or \[9\text{ }{{u}^{2}}-{{u}^{2}}=-2g\text{ }H\] or H \[=\frac{4{{u}^{2}}}{g}\]


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