tempalte:
So we want to show that changing the wait, changes how long it takes the ball to fall a specific distance.
Well in theory, changing the weight (which is what you meant I guess 8) ) won't change the time, although with "floaty" objects it might.
Here's a much simpler experiment and involves nothing but the stop watch on your cellphone. Set up a simple pendulum, and show that the mass doesn't affect the time of the swing, only the length does.
Edit.... and while you're at it, verify that T = 2 pi (l / g)1/2 or conversely rearrange and use it as a means of showing what g is