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J & K CET Medical J & K - CET Medical Solved Paper-2012

  • question_answer
    A rubber ball is bounced on the floor of a room which has its ceiling at a height of 3.2 m from the floor. The ball hits the floor with a speed of 10 m/s and rebounds vertically up. If all collisions simply reverse the velocity of the ball, without changing its speed, then how long does it take the ball for a round trip, from the moment it bounces from the floor to the moment it returns back to it? Acceleration due to gravity is\[10\text{ }m/{{s}^{2}}\].

    A)  4s             

    B)  2s

    C)  0.8 s           

    D)  1.2 s

    Correct Answer: C

    Solution :

     Time, \[t=\sqrt{\frac{2h}{g}}\] \[=\sqrt{\frac{2\times 3.2}{10}}\] \[=0.8s\]


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