building up momentum for my MINIATURE prototype, made of organic materials, while its moving?

Question

my project is to be able to build an organic prototype that will be able to travel a 7 degrees elevated surface and be able to go through an incline plane with heights of 6, 9 and 12 inches. The objective of this is to have the protoype make a projectile flight that will land on our cylindrical shaped target. There is no inorganic force that can affect my prototype. I was thinking of having the car wind up while its moving so that it will build up momentum to make the jump however I am lacking in knowledge in how to do this. Is there actually a way for me to increase the kinetic energy of my prototype while its moving, if so how....if i am doing the winding of the wheels how am i to do so with only organic materials? please help thank you.....

Organic could be wood, organic glue, cement...and etc....I am not allowed to use metal, plastic, and nails..I hope this helps

Answer 1

Please share the definition of "organic" as used in your project so we will understand what is needed.