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9th Class Science Work and energy Question Bank Work, Energy and Power

  • question_answer
    A 500 gm ball is thrown vertically upwards with a kinetic energy 58.8 J. The kinetic energy is reduced to half at a height of.......... metre above the point of throw,

    A)  2m                 

    B)         3 m

    C)  5m                        

    D)         6 m  

    Correct Answer: D

    Solution :

     In reaching upto desired height, Change in kinetic energy \[=\] Change in potential energy or            \[\frac{58.8}{2}=mgh\]or                   \[h=6\,\,m\]


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