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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    A ball is dropped vertically from a height d above the ground. It hits the ground and bounces up vertically to a height d/2. Neglecting subsequent motion and air resistance, its velocity V varies with the height h above the ground, as:

    A)    

    B)  

    C)   

    D)  

    Correct Answer: A

    Solution :

    The kinematical equations of motion of the ball while falling down is, \[V=-\sqrt{2gh}\] So, speed just before the impact,             \[{{V}_{1}}=-\sqrt{2gd}\] and speed just after the impact,             \[{{V}_{2}}=\sqrt{2g(d/2)}\] Afterword?s     \[V=\sqrt{V_{2}^{2}-2gh}\]


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