The path of motion of a roller-coaster is shown in the figure. At the start of the roller-coaster ride, a motor pulls it from point W to X. Although there is no motor to pull it up from point Y to Z, it still moves through the loop by itself.
Identify the energy conversions from Y to Z.
1
Electrical energy → Potential energy
2
Kinetic energy → Potential energy
3
Kinetic energy → Electrical energy
4
Potential energy → Kinetic energy
5
Not Attempted