We get to choose our projectile, I'm thinking golf ball or marble. For the targets on walls, correct me if I'm wrong, but couldn't I use h(t) = (1/2)at^2 + vt + h and find my two points at which h = target height and omit the incorrect one?
I was planning on using bungee cords. I have looked online but most are not adjustable. Some targets will be on the ground, some will be on a wall.
As for which would be easier I'm not sure. I could use a force spring to measure my Newtons but that would be an approximate force.
For my term project we were challenged to build a catapult that can be adjusted to hit 3 pre-determined targets, and 3 surprise targets. I have come up with a design, but I'm not sure it's the most effiecient materials wise. I also would like some insight on the design.I believe I should stop...