If the energy of ball falling from a height of 20metres is reduced by 60% how high will it rebound
Answers
Answer:
Applying the law of conservation of energy to any situation, when a ball is dropped from any height, all of its energy has to be accounted for. If none of the energy is transformed into other forms such as sound and heat, then all of the energy will change from GPE into KE as it falls, and then from KE into GPE as it rises again after bouncing. In this hypothetical situation, the ball must rebound to its original height.
Normally, however, a reasonable percentage of the energy will be transformed into other forms. As the GPE of a falling body is given by GPE = mgh, then if 40% of the total energy is turned into other forms, only 60% will remain as GPE when it bounces to its maximum height, and its rebound height will be 60% of its original height. If it was droppped from an original height of 10m, it will rebound to 6m.