The desperate contestants on a TV survival show are very hungry, but 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 which has a spring constant of 1600 N/mN/m . They can compress the spring by a maximum of 18.1 cmcm and they choose a rock that has a mass of 679 gg . With what speed does the rock leave the end of the spring?   If they hope to dislodge a piece of fruit using their device, what is the highest the fruit could be above the end of their spring?

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