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A spring (k = 927 N/m) is attached to the ceiling of an elevator. How much will the spring stretch (relative to its unstretched length),

A spring (k = 927 N/m) is attached to the ceiling of an elevator. How much will the spring stretch (relative to its unstretched length), if a 4.2 kg object is attached to the lower end and the elevator is accelerating downward at 0.42 m/s2?

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