Determine the amount of potential energy of a 5.0kg book that is moved to three different shelves on a bookcase. the height of each shelf is 1.0 m, 1.5 m, and 2.0 m.

what is the question because that is not a question.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.