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oops, yes. Apologies, .You mean (v2*sin2A)/g.

OK, that makes a lot more sense now. Thanks very much, haruspex.Also, it looks like at release the projectile is about 2.7cm above the ground, which should add about 5cm to the range.

Feeding 111cm into the formula I get 3.7m/s.

Thanks again, erobz. I presume it is OK for me to use your diagram (but with numbers, since an equation with that many variables is a bit much for a 13-year old) in explaining some of these ideas in my next lesson with the student?Ok, so this is where the actual geometry of the slingshot could come into play.