Spring constant and speed question?

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The desperate contestants on a TV survival show are very hungry. The only food they can see is some fruit hanging on a branch high in a tree. Fortunately, they have a spring they can use to launch a rock. The spring constant is 1600 N/m, and they can compress the spring a maximum of 15 cm. All the rocks on the island seem to have a mass of 450 g.

1.)With what speed does the rock leave the spring? Answer in m/s with 2 significant figures.
 
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