1. The problem statement, all variables and given/known data A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 19.00 m. When she is partway down the slide, at a height h2 of 6.00 m, she is moving at a speed of 9.10 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.). http://schubert.tmcc.edu/enc/81/eb6d48e17d7ac6da6bcc155569197bc91de6184725281bb9c7a8766b6518bc88bed47674ecdc931377509dc0eb7e26d7db2890f53e24b7f2d99a7111ddfa3536dc35b6f684771013136fcdf8150697ebc0e216fcb068cc8874c532077ab9fdb93e14da5cdf2b76ec.gif 2. Relevant equations 3. The attempt at a solution This question has something to do with change in potential energy and kinetic energy, but i am not sure where to go.