New Enroll in RBI Grade B New Batch - Starts on May 21

    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. Eachtime, a normal rubber ball hitsthe floor, it losesone-fifthofitstotalenergyandtherebound heightisproportionaltoenergy,soeachbounce will rebound to four-fifth of the previous bounce.

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