JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति JEE PYQ - Work Energy Power and Collision

  • question_answer
    A ball is dropped vertically downwards from a height h above the ground. It hits the ground in elastically and bounces up vertically. Neglecting subsequent motion and air resistance, which of the following graph represents variation between speed (v) and height correctly? [JEE ONLINE 26-05-2012]

    A)

    B)

    C)

    D)

    Correct Answer: D

    Solution :

    [d] When a ball hits the ground vertically then some of its energy is lost due to which it bounces back to lesser height with less velocity. The energy of the ball keep on decreasing with time and finally it become zero. Due to this variation of velocity with height can be represented as follows:


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