Question

a person hangs three pictures on the wall. the pictures all weigh the same. picture 1 and picture 2 are at the same height above the floor. picture 3 is directly below picture 1. which pictures have the same amount of gravitational potential energy?

Answer 1

Picture 1 and 2 or am I wrong and it's not that obvious.

Answer 2

Gravitational potential energy is given by the equation GPE = mgh

So if the masses are the same, and gravity will always be the same as long as we stay on earth, then the only thing that is changing here is the height. Since picture 3 is lower then 1 and 2 it has the least amount of GPE since its height is lower. Since picture 1 and 2 are at the same height they must have the same GPE as everything in the equation would be the same.

Hopefully this makes sense and helps!