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OpenStudy (anonymous):

How do I calculate the spring constant given mass, compressed length, and speed? A spring-loaded toy dart gun fires darts with a mass of 105 g. When the spring in the dart gun is compressed 8 cm, the dart flies off with a speed of 11.3 m/s. What is the spring constant of the spring in the dart gun? I don't really know where to start.

OpenStudy (anonymous):

I got 686,000 N*m. Accurate, yes? no?

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