Project help.

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?
 
Does it have to be a catapult, or can it be a trebuchet? Trebuchet's are much easier to build, generally.
 

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