circular motion radius

[smashingtime]

1. The problem statement, all variables and given/known data
Hi, I conducted a circular motion experiment--with a rubber bung & string through a plastic tube. I changed the radius of the string every trial, calculated the amount of time for one revolution, and from that derived velocity and velocity^2.

With my data, I graphed Velocity^2 against Radius. I found a linear line of best fit for the graph.
From here, how should I proceed to obtain the formula acceleration = V^2/r?

Thanks!

[natugnaro]

a=v^2/r => v^2=a*r

so you need slope of your fit line