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We are given no equations, but I have been using the kinetic and gravitational potential energy equations.

I have trial data in which I have calculated the spring constant - at 184 n/m.

I have calculated an equation which shows EPE = Fx/2 (the area under the trial data graph is EPE, as it is a force (F) vs extension (x) graph).

On the net I found the equation: u = [tex]\sqrt{Rg/2sin20}[/tex]

R-range

g-gravity

How should I go about solving this? We need to collect data from repeated tests etc, its an investigation.

Thanks a lot! :)