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but anyway here is the question:

A 40.0 kg child in a swing that is attatched to ropes 2.00m long. Find the gravitional potential energy associated with the child relative to the child's lowest position under the following conditions...

A. when the ropes are horizontal

B. at the bottom ofa circular arc

Now i understand that the formula is Pe = mass x gravity x height

BUT HOW MUST I FIND THE HEIGHT? i am just going back and forth on this one, any help is appreciated..