julian sience

what angle must my ping pong catapult be to launch a pin pong ball and a golf ball? this will help me learn about air currents and drag so i know how to learn about flight.for the golf ball i think it will take like 45 degrees and the ping pong ball like 90 degrees. the subject of my background research is aerodynamic drag and air currents.first i will make the catapult then i will get a golf ball and a ping pong ball i will take the weight of each and try 4 or 5 trials.i will need iron rubber bands pin protractor and a thing i can measure the length how far it goes.i will use a line plot so i can see trial 1 20 degrees 2 ft and plot it.i will take pictures of the balls i am using so i can show you and the catapult at different angles.i will also take a video of all of it. the obstacles i must overcome are the wind the weight and the weather. SOON I AM READY!!!!!!!