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    Physics - Work-Energy Theorem

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    A 70 kg person uses 204.0 kJ of energy to walk a kilometer. This energy comes from "burning" glucose, but only about 30.0% of the heat of combustion of glucose can be used for propulsion. The rest is used for other body functions or is wasted as heat. Assuming that a sugar-coated cereal contains 30.0% sugar (which can be considered glucose) and no other energy source, what mass of cereal will provide enough energy to walk 0.5 km.

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    Let the mass of the cereal required be m g. This will have a sugar content of 30 %, which is

    0.3m. This is ...

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    The expert examines work-energy theorem. Neat, complete and step-by-step solution is provided.