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Suppose a mass of 2.0 kg hangs in an elevator from a spring of unknown spring...

Suppose a mass of 2.0 kg hangs in an elevator from a spring of unknown spring constant, k. Before the elevator moves the mass is 1.0 m from the ceiling. While the elevator is accelerating upwards at 1.0 m/s2 , the spring stretches an additional 5.0 cm. What is the spring constant k?

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