Question

    A rubber ball is dropped from a height of 2 metres. To

    what height will it rise if there is no loss of energy/velocity after rebounding?
    A 4 metres Correct Answer Incorrect Answer
    B 3 metres Correct Answer Incorrect Answer
    C 2 metres Correct Answer Incorrect Answer
    D 1 metre Correct Answer Incorrect Answer

    Solution

    The potential energy of a body when raised through height h is given by mgh. Each time, a normal rubber ball hits the floor, it loses one-fifth of its total energy and the rebound height is proportional to energy, so each bounce will rebound to four-fifth of the previous bounce.

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