Question

What energy conversion occurs when a sling shot is used to shoot a rock across the room

Answer 1

elastic potential converts to kinetic

Answer 2

You need to include the answers to ensure you get the right one. 
A. Stored mechanical energy is converted to mechanical energy. 
B. Stored mechanical energy is converted to radiant energy. 
C.Gravitational energy is converted to radiant energy.
D.Gravitational energy is converted to mechanical energy.
I'm gonna go with A.