A child in a sled is at rest on a hill. An adult pushes the child and sled to the edge of the hill (point B) where the child and

sled have a potential energy of800 J and a kinetic energy of 100 J. The child and sled then travels down the hill through point C and up smaller hill to point D. 400 J of energy are transferred to the environment between point B and point D. The child and sled have a combined mass of 20 kg. The height of point D is 1 m. Use the bar graphs below to indicate the mechanical energy (ME), gravitational potential energy (GPE), and kinetic energy (KE) of the child and sled at points B and D.