we were given a project in physics where you build a catapult that shoots a tennis ball 2, 4, or 6m. Now i have a basic design that im not sure if it will shoot 2m. all i need is the ball to be able to shoot 2m into a 5 gallon bucket. here is the design i am loooking at: http://www.stormthecastle.com/catapult/catapult-assembly1.htm Also. if i decrease the stopping point of the catapult will that increase the distance?