- #1

chops369

- 56

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## Homework Statement

I don't know if anyone can help me with this without having done the lab, but I thought I'd give it a shot. Ok, so I did a lab in my physics class where we used little rollercoasters to find the PE and KE of a marble at various heights and speeds. Here is the question in my lab write-up that has me stumped.

How can you use energy conservation to predict the speed of the marble from the height?

## Homework Equations

PEi + KEi = PEf = KEf

## The Attempt at a Solution

I know that you can obtain the equation Vf = √2gh

_{i}from energy conservation, but that doesn't seem to be working when I plug in the height. It isn't coming out to the correct speed which I already calculated.