A rollercoaster goes down hill
a. kinetic energy is converted into potential energy
b. potential energy is converted into kinetic energy
c. electrical energy is converted into potential energy
d. potential energy is converted into electrical energy

Zamir and talia raced through a maze. zamir walked 2 m north, 2 m east, 4 m south, 2 m east, 4 m north, 2 m east, 3 m south, 4 m east and 4 m north. talia walked 2 m north, 6 m east, 3 m south, 4 m east, and 4 m north. compare their displacements: zamir's displacement is talia's displacement.