A 600,000 kg subway train is brought to a stop from a speed of 0.5 m/s by a large spring bumper at the end of
its track which compresses 0.4 m. This transfer of
energy has been loaded onto the spring. What is the
spring constant of the bumper?

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Which lists the fundamental forces in order, from strongest to weakest? strong nuclear, weak nuclear, electromagnetic, gravitational strong nuclear, electromagnetic, weak nuclear, gravitational gravitational, weak nuclear, electromagnetic, strong nuclear electromagnetic, gravitational, strong nuclear, weak nuclear

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