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A national network of high speed trains can be powered by a combination of renewable energy sources including wind, solar, geothermal, and ocean/tidal energy.America's dependency on oil is the most severe in the world, and inevitably pulls us into costly resource wars.
in roller coasters the two forms of energy that are most important are gravitational potential energy and kinetic energy gravitational potential energy is the energy that an object has because of its height and is equal to the object s mass multiplied by its height multiplied by the gravitational constant pe mgh