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Conservation of energy A child on a sled slides from rest from the top of a 20.0 m high very slippery hill. The total mass of the child and the sled is 30.0 kg. Treat the bottom of the hill as a reference. a. b. c. d. e. What is the kinetic energy of the child and sled at the top? What is the potential energy at the top? What is the potential energy at the bottom? What is the kinetic energy at the bottom? What is the speed of the child and sled at the bottom?

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