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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    On a frictionless surface, a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle 6 to its initial direction and has a speed The second block's speed after the collision is:

    A) \[\frac{3v}{\sqrt{2}}\]                           

    B) \[\frac{\sqrt{3v}}{2}\]

    C) \[\frac{\sqrt{gH}}{2}\]               

    D) \[\frac{\sqrt{2g}}{H}\]

    Correct Answer: C

    Solution :

    [c] \[g''=\frac{GM}{{{R}^{2}}}\left[ 1-\frac{d}{R} \right]=g\left[ 1-\frac{d}{R} \right]\] \[g'=0\,at\,d=R\] Acceleration due to gravity is zero at earth centre \[For\,r>Rg'\propto \frac{1}{{{r}^{2}}}\] \[For\,r>Rg'=g\left[ 1-\frac{d}{R} \right]=\frac{gr}{R}\] \[g'\propto r\]


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