Need help with a physics practical to do with slingshots?

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Need help with a physics practical to do with slingshots!?

Basically I am doing a project on slingshots, we are allowed to investigate any areas do do with physics, however I need some ideas, I was hoping I could change a couple of variables and measure things.

my idea was to change the density of the rubber band used in the sligshot and measure the potential energy, then work out the speed of the stone as it leaves the slingshot using KE=1/2 MV^2

But I feel that's not enough

Please can someone help me to find other PHYSICS area which I could investigate.
 
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You could vary how far back you pull the slingshot and then measure the resulting distance traveled by the shot?
 

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