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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.
A moving car has kinetic energy. If it speeds up until it is going four times as fast, how much kinetic energy does it have in comparison? Work-Energy Theorem 11. Compared to some original speed, how much work must the brakes of a car supply to stop a car moving four times as fast? How will the stopping distance compare? Conservation of Energy 12.