"A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 20.00 m. When she is partway down the slide, at a height h2 of 8.00 m, she is moving at a speed of 8.90 m/s. Calculate the mechanical energy lost due to friction (as heat, etc.)."© BrainMass Inc. brainmass.com March 4, 2021, 5:46 pm ad1c9bdddf
The potential energy of the child at h1 is given by
PE1 = m g h1 = 25 * 9.8 * 20 = 4900 Joules This much amount of energy must be present throughout the journey. ...
The solution discusses the energy lost due to friction.