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  5. Work and energy

9th Class Science Work and energy Question Bank Work Power and Energy HOTS Subjective Problems

  • question_answer
    A body falling from a height of 10 m rebounds from a hard floor. If it loses 20% of its energy in impact, what is the height to which it rises?

    Answer:

    Let the rise be ?h?. \[PE=mgh\] K.E. at the ground = 80 % of initial PE = \[\frac{80}{100}\times m\times g\times 10=mgh\] \[\therefore h=8\,\,m.\]


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