Where on a rollercoaster is potential energy the greatest? The least?

Please help me, this is due tomorrow. I have a bunch of other questions along with this. I am such a procrasinator. >.< Thank you! -Pancake

What's the formula of of potential? (mass)*(gravity)*(height)*

Mass and gravity stays is constant, but height is not...

So, the potential energy is greatest when the height is ____?

formula of of potential energy*

At the lowest point?

plug in a low value for height in the formula? will that yield a high potential energy?

mg(height)

I think so.....sorry I'm not very good at science.

mg(1) vs. mg(100000000000)

which one is greater?

mg(100000000000) is greater.