The cart has no mechanical energy. The cart's mechanical energy is all kinetic. The cart's mechanical energy is all potential. The cart's mechanical energy is half potential and half kinetic.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following describes the mechanical energy of a cart at rest at the top of a steep hill?
Possibilities:
- The cart has no mechanical energy.
- The cart's mechanical energy is all kinetic.
- The cart's mechanical energy is all potential.
- The cart's mechanical energy is half potential and half kinetic.

The cart's mechanical energy is all potential.