With what speed does the rock leave the spring?

Question

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 1200 N/m, and they can compress the spring a maximum of 44 cm. All the rocks on the island seem to have a mass of 380 g.

With what speed does the rock leave the spring?

(b) To what height can the rock be launched?

Answer 1

Whenever he wants, if you smell what The Rock is cookin'!