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please show work A railroad track and a road cross at right angles. An observer stands on the road 7 meters south of the crossing

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please show work

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A railroad track and a road cross at right angles. An observer stands on the road 7 meters south of the crossing and watches an eastbound train traveling at 6 meters per second. At how many meters per second is the train moving away from the observer 4 seconds after it passes through the inter

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