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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.
When a researcher inadvertently encourages subjects to respond in a way that supports their hypothesis. A train accelerates at a rate of 2.5 km/he/sec. during the acceleration period it's velocity changes by 55 km/hr. How long did the train accelerate.