Question

What is the difference between kinetic and mechanical energy?

Answer 1

The energy acquired by the objects upon which work is done is known as mechanical energy. Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position).

Source:
http://www.physicsclassroom.com/class/energy/Lesson-1/Mechanical-Energy

Answer 2

Kinetic energy is the energy of motion. So when an object is moving it has kinetic energy. Mechanical energy is the moving of parts a roller coaster would have mechanical energy because the chain the pulls you up the first hill has moving parts so it is mechanical energy.