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If a spring has a stiffness (spring constant) of 24N/m how much must the spring be...

If a spring has a stiffness (spring constant) of 24N/m how much must the spring be compressed to launch a 5 kg block to a hieght of 35m above the ground. What velocity does the brick have when leaving the spring. When the brick has 300 Joules of kinetic energy left what is it's hieght?

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