Once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.
What is potential energy?
Potential energy is a type of energy that is stored and depends upon the relative height of system. If its height is increased, the potential energy is also increases while on the other hand, if the body comes to the surface of the earth, its potential energy will be zero due to no height of the object. We know that potential energy is equals to product of mass, gravity and height of an object.
So we can conclude that if the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 J, and its potential energy decreases to zero.