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A large fish hangs from the roof of an elevator via a spring of spring constant...

A large fish hangs from the roof of an elevator via a spring of spring constant ? = 600 N/m and unstretched length ?0 = 0.500 m. The elevator is initially moving downwards at a constant 2.45 m/s, but then slows to a stop in 1.20 s. If the spring has a length of 0.600 m while slowing down, what is the mass of the fish?

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