After school you have been working on your slingshotmanship. Interested in the physics of the slingshot, you take data that compares the force of the extended slingshot versus the displacement from equilibrium. You think this graph is very similar to that of a spring so you decide to solve for the spring constant of the rubber band. If the slingshot is stretched back 30 centimeters and released about how much energy is put into a 50 gram Rock? What is the velocity of the rock upon release from the slingshot?