Eliana cuts a watermelon into several slices. which statement best describes the physical change?

Indeed this is a physical change.

Explanation: The explanation is based in, firstly, sliding a watermelon does not produce a new substance. It is the same component but with a different look. On the other hand, when we are talking about a chemical change it is because a new substance was produced, in most cases due to a chemical reaction, for example, combustion.

the closer the planet is to the sun, the larger the gravity

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.