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Spring constant: Ore car rolls down a frictionless incline

A 2000 kg ore car rolls 50.0 m down a frictionless 10.0 degree incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 1.00m?

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First, I believe you meant that the spring was parallel to the track, and not horizontal, though if the ore car rolls down the track then moves onto level, horizontal track, then contacts the spring and is brought to ...

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