[Kevin Sevcik]

I'm not sure your math is correct there. At the least, your acceleration calculation seems wrong. You're basing acceleration off your "Weight N" and "Force applied". "Weight N" seems to be the vertical force of the object you're launching. Acceleration is based off the total force applied and the mass of the object you're accelerating. In your calculations, it's like the mass of the object changes based on the rotation of the arm.

I'm not sure if there's other problems. I usually do my spreadsheets iterating through time instead of position, so I'm not sure if your time per distance calculations are correct or not.