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9th Class Science Work and energy Question Bank 9th CBSE Science Work and energy

  • question_answer
      A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back?      

    Answer:

                 If the energy of the ball reduces by 40% after striking the ground, then remaining energy of the ball will be 60% of initial energy.                                    mgh' = 60% of mgh


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