The greatest amount of kinetic energy is found with the train because it takes most energy to reach that velocity and also to slow down to a halt.
C
Because magnet involves 2 opposite poles so therefore it would have to be C
(D) The gravitational force between the astronaut and the asteroid.
Reason :
All the other forces given in the options, except (D), doesn't account for the motion of the astronaut. They are the forces that act between nucleons or atoms and neither of them accounts for an objects motion.
Inertia is the tendency of an object to resist changes in its state of motion.
