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A 5.18x10^4 kg railroad car moves on a frictionless horizontal rails until it hits a horizontal spring stopper with a force constant of 4.21x10^5 N/m. When the railroad car comes to a complete stop, the compression of the spring stopper is 32 cm. How fast was the railroad car initially?
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A 5.18x10^4 kg railroad car moves on a frictionless horizontal rails until it hits a horizontal spri...
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