We are asked to identify two locations along the frictionless track that have the same amount of potential
energy.
Recall that the potential energy is the energy of an object due to its position.
For the given case, the potential energy is due to the height of the roller coaster.
Notice that the height of the roller coaster is zero at location C and E
This means that the roller coaster will have zero potential energy at these two locations.
Therefore, we can conclude that at locations C and E the roller coaster will have the same amount of potential
energy (that is zero)
