Answer: elastic PE to kinetic energy
Step-by-step explanation: According to the law of conservation of energy, the energy must be conserved. It transforms from one form to another.
Elastic potential energy is the energy stored as a result of deformation of an elastic object. The deformation could involve compressing, stretching or twisting the object. Kinetic energy is the energy which is the energy possessed by a body by virtue of its motion.
When a slingshot launches a stone the elastic potential energy in the slingshot converts to kinetic energy which helps the stone to launch.